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Finding the Fourth Proportional to 749.78, 1,124.40 and 287.32

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Solution

The fourth proportional to 749.78, 1,124.40 and 287.32 is: 430.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.78 : 1,124.40 = 287.32 : x
  2. Step 2: Convert to fraction form
    749.78/1,124.40 = 287.32/x
  3. Step 3: Cross multiply
    749.78x = 1,124.40 × 287.32
  4. Step 4: Simplify right side
    749.78x = 323,062.61
  5. Step 5: Solve for x
    x = 323,062.61/749.78
  6. Step 6: Final answer
    x = 430.88

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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.