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Finding the Fourth Proportional to 753.18, 1,128.90 and 631.08

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Solution

The fourth proportional to 753.18, 1,128.90 and 631.08 is: 945.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.18 : 1,128.90 = 631.08 : x
  2. Step 2: Convert to fraction form
    753.18/1,128.90 = 631.08/x
  3. Step 3: Cross multiply
    753.18x = 1,128.90 × 631.08
  4. Step 4: Simplify right side
    753.18x = 712,426.21
  5. Step 5: Solve for x
    x = 712,426.21/753.18
  6. Step 6: Final answer
    x = 945.89

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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.