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Finding the Fourth Proportional to 929.16, 1,391.94 and 489.78

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Solution

The fourth proportional to 929.16, 1,391.94 and 489.78 is: 733.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.16 : 1,391.94 = 489.78 : x
  2. Step 2: Convert to fraction form
    929.16/1,391.94 = 489.78/x
  3. Step 3: Cross multiply
    929.16x = 1,391.94 × 489.78
  4. Step 4: Simplify right side
    929.16x = 681,744.37
  5. Step 5: Solve for x
    x = 681,744.37/929.16
  6. Step 6: Final answer
    x = 733.72

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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.