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Finding the Fourth Proportional to 122,488.63, 168,991.63 and 77,170.66

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Solution

The fourth proportional to 122,488.63, 168,991.63 and 77,170.66 is: 106,468.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,488.63 : 168,991.63 = 77,170.66 : x
  2. Step 2: Convert to fraction form
    122,488.63/168,991.63 = 77,170.66/x
  3. Step 3: Cross multiply
    122,488.63x = 168,991.63 × 77,170.66
  4. Step 4: Simplify right side
    122,488.63x = 13,041,195,621.58
  5. Step 5: Solve for x
    x = 13,041,195,621.58/122,488.63
  6. Step 6: Final answer
    x = 106,468.62

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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.