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Finding the Fourth Proportional to 112,878.97, 169,346.70 and 79,663.91

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Solution

The fourth proportional to 112,878.97, 169,346.70 and 79,663.91 is: 119,515.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,878.97 : 169,346.70 = 79,663.91 : x
  2. Step 2: Convert to fraction form
    112,878.97/169,346.70 = 79,663.91/x
  3. Step 3: Cross multiply
    112,878.97x = 169,346.70 × 79,663.91
  4. Step 4: Simplify right side
    112,878.97x = 13,490,819,420.86
  5. Step 5: Solve for x
    x = 13,490,819,420.86/112,878.97
  6. Step 6: Final answer
    x = 119,515.79

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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.