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Finding the Fourth Proportional to 753.10, 1,129.14 and 259.38

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Solution

The fourth proportional to 753.10, 1,129.14 and 259.38 is: 388.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.10 : 1,129.14 = 259.38 : x
  2. Step 2: Convert to fraction form
    753.10/1,129.14 = 259.38/x
  3. Step 3: Cross multiply
    753.10x = 1,129.14 × 259.38
  4. Step 4: Simplify right side
    753.10x = 292,876.33
  5. Step 5: Solve for x
    x = 292,876.33/753.10
  6. Step 6: Final answer
    x = 388.89

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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.