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Finding the Fourth Proportional to 79,989.60, 110,127.36 and 65,818.08

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Solution

The fourth proportional to 79,989.60, 110,127.36 and 65,818.08 is: 90,616.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,989.60 : 110,127.36 = 65,818.08 : x
  2. Step 2: Convert to fraction form
    79,989.60/110,127.36 = 65,818.08/x
  3. Step 3: Cross multiply
    79,989.60x = 110,127.36 × 65,818.08
  4. Step 4: Simplify right side
    79,989.60x = 7,248,371,390.67
  5. Step 5: Solve for x
    x = 7,248,371,390.67/79,989.60
  6. Step 6: Final answer
    x = 90,616.42

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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.