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Finding the Fourth Proportional to 711.20, 981.18 and 525.13

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Solution

The fourth proportional to 711.20, 981.18 and 525.13 is: 724.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.20 : 981.18 = 525.13 : x
  2. Step 2: Convert to fraction form
    711.20/981.18 = 525.13/x
  3. Step 3: Cross multiply
    711.20x = 981.18 × 525.13
  4. Step 4: Simplify right side
    711.20x = 515,247.05
  5. Step 5: Solve for x
    x = 515,247.05/711.20
  6. Step 6: Final answer
    x = 724.48

Related Problems

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Half scale
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Double scale
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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.