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Finding the Fourth Proportional to 923.67, 1,385.69 and 491.13

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Solution

The fourth proportional to 923.67, 1,385.69 and 491.13 is: 736.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.67 : 1,385.69 = 491.13 : x
  2. Step 2: Convert to fraction form
    923.67/1,385.69 = 491.13/x
  3. Step 3: Cross multiply
    923.67x = 1,385.69 × 491.13
  4. Step 4: Simplify right side
    923.67x = 680,551.47
  5. Step 5: Solve for x
    x = 680,551.47/923.67
  6. Step 6: Final answer
    x = 736.79

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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.