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Finding the Fourth Proportional to 929.19, 1,391.07 and 489.39

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Solution

The fourth proportional to 929.19, 1,391.07 and 489.39 is: 732.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.19 : 1,391.07 = 489.39 : x
  2. Step 2: Convert to fraction form
    929.19/1,391.07 = 489.39/x
  3. Step 3: Cross multiply
    929.19x = 1,391.07 × 489.39
  4. Step 4: Simplify right side
    929.19x = 680,775.75
  5. Step 5: Solve for x
    x = 680,775.75/929.19
  6. Step 6: Final answer
    x = 732.66

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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.