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Finding the Fourth Proportional to 661.16, 913.56 and 531.20

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Solution

The fourth proportional to 661.16, 913.56 and 531.20 is: 733.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.16 : 913.56 = 531.20 : x
  2. Step 2: Convert to fraction form
    661.16/913.56 = 531.20/x
  3. Step 3: Cross multiply
    661.16x = 913.56 × 531.20
  4. Step 4: Simplify right side
    661.16x = 485,283.07
  5. Step 5: Solve for x
    x = 485,283.07/661.16
  6. Step 6: Final answer
    x = 733.99

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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.