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Finding the Fourth Proportional to 138,166.88, 190,670.30 and 78,550.88

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Solution

The fourth proportional to 138,166.88, 190,670.30 and 78,550.88 is: 108,400.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,166.88 : 190,670.30 = 78,550.88 : x
  2. Step 2: Convert to fraction form
    138,166.88/190,670.30 = 78,550.88/x
  3. Step 3: Cross multiply
    138,166.88x = 190,670.30 × 78,550.88
  4. Step 4: Simplify right side
    138,166.88x = 14,977,319,854.86
  5. Step 5: Solve for x
    x = 14,977,319,854.86/138,166.88
  6. Step 6: Final answer
    x = 108,400.22

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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.