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Finding the Fourth Proportional to 753.54, 1,128.15 and 630.42

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Solution

The fourth proportional to 753.54, 1,128.15 and 630.42 is: 943.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.54 : 1,128.15 = 630.42 : x
  2. Step 2: Convert to fraction form
    753.54/1,128.15 = 630.42/x
  3. Step 3: Cross multiply
    753.54x = 1,128.15 × 630.42
  4. Step 4: Simplify right side
    753.54x = 711,208.32
  5. Step 5: Solve for x
    x = 711,208.32/753.54
  6. Step 6: Final answer
    x = 943.82

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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.