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Finding the Fourth Proportional to 714.72, 985.86 and 630.48

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Solution

The fourth proportional to 714.72, 985.86 and 630.48 is: 869.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.72 : 985.86 = 630.48 : x
  2. Step 2: Convert to fraction form
    714.72/985.86 = 630.48/x
  3. Step 3: Cross multiply
    714.72x = 985.86 × 630.48
  4. Step 4: Simplify right side
    714.72x = 621,565.01
  5. Step 5: Solve for x
    x = 621,565.01/714.72
  6. Step 6: Final answer
    x = 869.66

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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.