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Finding the Fourth Proportional to 811.12, 1,216.56 and 291.03

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Solution

The fourth proportional to 811.12, 1,216.56 and 291.03 is: 436.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.12 : 1,216.56 = 291.03 : x
  2. Step 2: Convert to fraction form
    811.12/1,216.56 = 291.03/x
  3. Step 3: Cross multiply
    811.12x = 1,216.56 × 291.03
  4. Step 4: Simplify right side
    811.12x = 354,055.46
  5. Step 5: Solve for x
    x = 354,055.46/811.12
  6. Step 6: Final answer
    x = 436.50

Related Problems

Find fourth proportional to 405.56, 608.28 and 145.52
Half scale
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Double scale
Find fourth proportional to 812.12, 1,218.06 and 292.03
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.