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Finding the Fourth Proportional to 921.58, 1,381.02 and 489.04

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Solution

The fourth proportional to 921.58, 1,381.02 and 489.04 is: 732.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.58 : 1,381.02 = 489.04 : x
  2. Step 2: Convert to fraction form
    921.58/1,381.02 = 489.04/x
  3. Step 3: Cross multiply
    921.58x = 1,381.02 × 489.04
  4. Step 4: Simplify right side
    921.58x = 675,374.02
  5. Step 5: Solve for x
    x = 675,374.02/921.58
  6. Step 6: Final answer
    x = 732.84

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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.