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Finding the Fourth Proportional to 728.77, 1,006.08 and 492.93

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Solution

The fourth proportional to 728.77, 1,006.08 and 492.93 is: 680.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.77 : 1,006.08 = 492.93 : x
  2. Step 2: Convert to fraction form
    728.77/1,006.08 = 492.93/x
  3. Step 3: Cross multiply
    728.77x = 1,006.08 × 492.93
  4. Step 4: Simplify right side
    728.77x = 495,927.01
  5. Step 5: Solve for x
    x = 495,927.01/728.77
  6. Step 6: Final answer
    x = 680.50

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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.