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Finding the Fourth Proportional to 691.68, 955.86 and 525.78

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Solution

The fourth proportional to 691.68, 955.86 and 525.78 is: 726.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.68 : 955.86 = 525.78 : x
  2. Step 2: Convert to fraction form
    691.68/955.86 = 525.78/x
  3. Step 3: Cross multiply
    691.68x = 955.86 × 525.78
  4. Step 4: Simplify right side
    691.68x = 502,572.07
  5. Step 5: Solve for x
    x = 502,572.07/691.68
  6. Step 6: Final answer
    x = 726.60

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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.