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Finding the Fourth Proportional to 632.78, 872.56 and 499.77

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Solution

The fourth proportional to 632.78, 872.56 and 499.77 is: 689.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.78 : 872.56 = 499.77 : x
  2. Step 2: Convert to fraction form
    632.78/872.56 = 499.77/x
  3. Step 3: Cross multiply
    632.78x = 872.56 × 499.77
  4. Step 4: Simplify right side
    632.78x = 436,079.31
  5. Step 5: Solve for x
    x = 436,079.31/632.78
  6. Step 6: Final answer
    x = 689.15

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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.