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Finding the Fourth Proportional to 691.13, 955.56 and 660.53

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Solution

The fourth proportional to 691.13, 955.56 and 660.53 is: 913.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.13 : 955.56 = 660.53 : x
  2. Step 2: Convert to fraction form
    691.13/955.56 = 660.53/x
  3. Step 3: Cross multiply
    691.13x = 955.56 × 660.53
  4. Step 4: Simplify right side
    691.13x = 631,171.27
  5. Step 5: Solve for x
    x = 631,171.27/691.13
  6. Step 6: Final answer
    x = 913.25

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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.