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Finding the Fourth Proportional to 753.42, 1,039.65 and 438.72

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Solution

The fourth proportional to 753.42, 1,039.65 and 438.72 is: 605.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.42 : 1,039.65 = 438.72 : x
  2. Step 2: Convert to fraction form
    753.42/1,039.65 = 438.72/x
  3. Step 3: Cross multiply
    753.42x = 1,039.65 × 438.72
  4. Step 4: Simplify right side
    753.42x = 456,115.25
  5. Step 5: Solve for x
    x = 456,115.25/753.42
  6. Step 6: Final answer
    x = 605.39

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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.