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Finding the Fourth Proportional to 154,503, 213,220.62 and 87,435

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Solution

The fourth proportional to 154,503, 213,220.62 and 87,435 is: 120,663.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,503 : 213,220.62 = 87,435 : x
  2. Step 2: Convert to fraction form
    154,503/213,220.62 = 87,435/x
  3. Step 3: Cross multiply
    154,503x = 213,220.62 × 87,435
  4. Step 4: Simplify right side
    154,503x = 18,642,944,909.70
  5. Step 5: Solve for x
    x = 18,642,944,909.70/154,503
  6. Step 6: Final answer
    x = 120,663.97

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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.