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Finding the Fourth Proportional to 287,570.60, 431,031.90 and 137,882.60

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Solution

The fourth proportional to 287,570.60, 431,031.90 and 137,882.60 is: 206,668.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,570.60 : 431,031.90 = 137,882.60 : x
  2. Step 2: Convert to fraction form
    287,570.60/431,031.90 = 137,882.60/x
  3. Step 3: Cross multiply
    287,570.60x = 431,031.90 × 137,882.60
  4. Step 4: Simplify right side
    287,570.60x = 59,431,799,054.94
  5. Step 5: Solve for x
    x = 59,431,799,054.94/287,570.60
  6. Step 6: Final answer
    x = 206,668.55

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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.