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Finding the Fourth Proportional to 753.28, 1,128.54 and 387.16

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Solution

The fourth proportional to 753.28, 1,128.54 and 387.16 is: 580.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.28 : 1,128.54 = 387.16 : x
  2. Step 2: Convert to fraction form
    753.28/1,128.54 = 387.16/x
  3. Step 3: Cross multiply
    753.28x = 1,128.54 × 387.16
  4. Step 4: Simplify right side
    753.28x = 436,925.55
  5. Step 5: Solve for x
    x = 436,925.55/753.28
  6. Step 6: Final answer
    x = 580.03

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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.