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Finding the Fourth Proportional to 753.38, 1,039.75 and 442.88

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Solution

The fourth proportional to 753.38, 1,039.75 and 442.88 is: 611.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.38 : 1,039.75 = 442.88 : x
  2. Step 2: Convert to fraction form
    753.38/1,039.75 = 442.88/x
  3. Step 3: Cross multiply
    753.38x = 1,039.75 × 442.88
  4. Step 4: Simplify right side
    753.38x = 460,479.28
  5. Step 5: Solve for x
    x = 460,479.28/753.38
  6. Step 6: Final answer
    x = 611.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.