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Finding the Fourth Proportional to 753.15, 1,039.33 and 421.59

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Solution

The fourth proportional to 753.15, 1,039.33 and 421.59 is: 581.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.15 : 1,039.33 = 421.59 : x
  2. Step 2: Convert to fraction form
    753.15/1,039.33 = 421.59/x
  3. Step 3: Cross multiply
    753.15x = 1,039.33 × 421.59
  4. Step 4: Simplify right side
    753.15x = 438,171.13
  5. Step 5: Solve for x
    x = 438,171.13/753.15
  6. Step 6: Final answer
    x = 581.78

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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.