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Finding the Fourth Proportional to 747.84, 1,121.72 and 285.84

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Solution

The fourth proportional to 747.84, 1,121.72 and 285.84 is: 428.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.84 : 1,121.72 = 285.84 : x
  2. Step 2: Convert to fraction form
    747.84/1,121.72 = 285.84/x
  3. Step 3: Cross multiply
    747.84x = 1,121.72 × 285.84
  4. Step 4: Simplify right side
    747.84x = 320,632.44
  5. Step 5: Solve for x
    x = 320,632.44/747.84
  6. Step 6: Final answer
    x = 428.74

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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.