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Finding the Fourth Proportional to 142,110.60, 213,263.10 and 78,930.60

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Solution

The fourth proportional to 142,110.60, 213,263.10 and 78,930.60 is: 118,449.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,110.60 : 213,263.10 = 78,930.60 : x
  2. Step 2: Convert to fraction form
    142,110.60/213,263.10 = 78,930.60/x
  3. Step 3: Cross multiply
    142,110.60x = 213,263.10 × 78,930.60
  4. Step 4: Simplify right side
    142,110.60x = 16,832,984,440.86
  5. Step 5: Solve for x
    x = 16,832,984,440.86/142,110.60
  6. Step 6: Final answer
    x = 118,449.89

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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.