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Finding the Fourth Proportional to 715,427.10, 987,074.10 and 428,842.62

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Solution

The fourth proportional to 715,427.10, 987,074.10 and 428,842.62 is: 591,673.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,427.10 : 987,074.10 = 428,842.62 : x
  2. Step 2: Convert to fraction form
    715,427.10/987,074.10 = 428,842.62/x
  3. Step 3: Cross multiply
    715,427.10x = 987,074.10 × 428,842.62
  4. Step 4: Simplify right side
    715,427.10x = 423,299,443,178.14
  5. Step 5: Solve for x
    x = 423,299,443,178.14/715,427.10
  6. Step 6: Final answer
    x = 591,673.76

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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.