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Finding the Fourth Proportional to 738.79, 1,108.69 and 492.28

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Solution

The fourth proportional to 738.79, 1,108.69 and 492.28 is: 738.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.79 : 1,108.69 = 492.28 : x
  2. Step 2: Convert to fraction form
    738.79/1,108.69 = 492.28/x
  3. Step 3: Cross multiply
    738.79x = 1,108.69 × 492.28
  4. Step 4: Simplify right side
    738.79x = 545,781.91
  5. Step 5: Solve for x
    x = 545,781.91/738.79
  6. Step 6: Final answer
    x = 738.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.