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Finding the Fourth Proportional to 922.16, 1,384.15 and 489.31

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Solution

The fourth proportional to 922.16, 1,384.15 and 489.31 is: 734.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.16 : 1,384.15 = 489.31 : x
  2. Step 2: Convert to fraction form
    922.16/1,384.15 = 489.31/x
  3. Step 3: Cross multiply
    922.16x = 1,384.15 × 489.31
  4. Step 4: Simplify right side
    922.16x = 677,280.06
  5. Step 5: Solve for x
    x = 677,280.06/922.16
  6. Step 6: Final answer
    x = 734.45

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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.