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Finding the Fourth Proportional to 1,312.25, 1,810.86 and 722.75

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Solution

The fourth proportional to 1,312.25, 1,810.86 and 722.75 is: 997.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.25 : 1,810.86 = 722.75 : x
  2. Step 2: Convert to fraction form
    1,312.25/1,810.86 = 722.75/x
  3. Step 3: Cross multiply
    1,312.25x = 1,810.86 × 722.75
  4. Step 4: Simplify right side
    1,312.25x = 1,308,799.07
  5. Step 5: Solve for x
    x = 1,308,799.07/1,312.25
  6. Step 6: Final answer
    x = 997.37

Related Problems

Find fourth proportional to 656.13, 905.43 and 361.38
Half scale
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Double scale
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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.