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Finding the Fourth Proportional to 753.64, 1,129.92 and 342.57

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Solution

The fourth proportional to 753.64, 1,129.92 and 342.57 is: 513.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.64 : 1,129.92 = 342.57 : x
  2. Step 2: Convert to fraction form
    753.64/1,129.92 = 342.57/x
  3. Step 3: Cross multiply
    753.64x = 1,129.92 × 342.57
  4. Step 4: Simplify right side
    753.64x = 387,076.69
  5. Step 5: Solve for x
    x = 387,076.69/753.64
  6. Step 6: Final answer
    x = 513.61

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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.