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Finding the Fourth Proportional to 753.08, 1,128.60 and 342.12

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Solution

The fourth proportional to 753.08, 1,128.60 and 342.12 is: 512.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.08 : 1,128.60 = 342.12 : x
  2. Step 2: Convert to fraction form
    753.08/1,128.60 = 342.12/x
  3. Step 3: Cross multiply
    753.08x = 1,128.60 × 342.12
  4. Step 4: Simplify right side
    753.08x = 386,116.63
  5. Step 5: Solve for x
    x = 386,116.63/753.08
  6. Step 6: Final answer
    x = 512.72

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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.