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Finding the Fourth Proportional to 109,040.80, 163,388.40 and 81,047.20

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Solution

The fourth proportional to 109,040.80, 163,388.40 and 81,047.20 is: 121,442.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,040.80 : 163,388.40 = 81,047.20 : x
  2. Step 2: Convert to fraction form
    109,040.80/163,388.40 = 81,047.20/x
  3. Step 3: Cross multiply
    109,040.80x = 163,388.40 × 81,047.20
  4. Step 4: Simplify right side
    109,040.80x = 13,242,172,332.48
  5. Step 5: Solve for x
    x = 13,242,172,332.48/109,040.80
  6. Step 6: Final answer
    x = 121,442.36

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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.