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Finding the Fourth Proportional to 749.67, 1,124.24 and 287.59

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Solution

The fourth proportional to 749.67, 1,124.24 and 287.59 is: 431.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.67 : 1,124.24 = 287.59 : x
  2. Step 2: Convert to fraction form
    749.67/1,124.24 = 287.59/x
  3. Step 3: Cross multiply
    749.67x = 1,124.24 × 287.59
  4. Step 4: Simplify right side
    749.67x = 323,320.18
  5. Step 5: Solve for x
    x = 323,320.18/749.67
  6. Step 6: Final answer
    x = 431.28

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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.