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Finding the Fourth Proportional to 691.63, 956.25 and 661.03

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Solution

The fourth proportional to 691.63, 956.25 and 661.03 is: 913.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.63 : 956.25 = 661.03 : x
  2. Step 2: Convert to fraction form
    691.63/956.25 = 661.03/x
  3. Step 3: Cross multiply
    691.63x = 956.25 × 661.03
  4. Step 4: Simplify right side
    691.63x = 632,105.16
  5. Step 5: Solve for x
    x = 632,105.16/691.63
  6. Step 6: Final answer
    x = 913.94

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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.