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Finding the Fourth Proportional to 753.15, 1,129.57 and 342.18

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Solution

The fourth proportional to 753.15, 1,129.57 and 342.18 is: 513.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.15 : 1,129.57 = 342.18 : x
  2. Step 2: Convert to fraction form
    753.15/1,129.57 = 342.18/x
  3. Step 3: Cross multiply
    753.15x = 1,129.57 × 342.18
  4. Step 4: Simplify right side
    753.15x = 386,519.64
  5. Step 5: Solve for x
    x = 386,519.64/753.15
  6. Step 6: Final answer
    x = 513.21

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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.