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Finding the Fourth Proportional to 749.78, 1,124.46 and 287.24

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Solution

The fourth proportional to 749.78, 1,124.46 and 287.24 is: 430.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.78 : 1,124.46 = 287.24 : x
  2. Step 2: Convert to fraction form
    749.78/1,124.46 = 287.24/x
  3. Step 3: Cross multiply
    749.78x = 1,124.46 × 287.24
  4. Step 4: Simplify right side
    749.78x = 322,989.89
  5. Step 5: Solve for x
    x = 322,989.89/749.78
  6. Step 6: Final answer
    x = 430.78

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Similar ratio
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1.5x scale

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.