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Finding the Fourth Proportional to 1,310.76, 1,808.82 and 721.26

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Solution

The fourth proportional to 1,310.76, 1,808.82 and 721.26 is: 995.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.76 : 1,808.82 = 721.26 : x
  2. Step 2: Convert to fraction form
    1,310.76/1,808.82 = 721.26/x
  3. Step 3: Cross multiply
    1,310.76x = 1,808.82 × 721.26
  4. Step 4: Simplify right side
    1,310.76x = 1,304,629.51
  5. Step 5: Solve for x
    x = 1,304,629.51/1,310.76
  6. Step 6: Final answer
    x = 995.32

Related Problems

Find fourth proportional to 655.38, 904.41 and 360.63
Half scale
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Double scale
Find fourth proportional to 1,311.76, 1,810.20 and 722.26
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.