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Finding the Fourth Proportional to 142,078.60, 213,215.10 and 78,898.60

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Solution

The fourth proportional to 142,078.60, 213,215.10 and 78,898.60 is: 118,401.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,078.60 : 213,215.10 = 78,898.60 : x
  2. Step 2: Convert to fraction form
    142,078.60/213,215.10 = 78,898.60/x
  3. Step 3: Cross multiply
    142,078.60x = 213,215.10 × 78,898.60
  4. Step 4: Simplify right side
    142,078.60x = 16,822,372,888.86
  5. Step 5: Solve for x
    x = 16,822,372,888.86/142,078.60
  6. Step 6: Final answer
    x = 118,401.88

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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.