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Finding the Fourth Proportional to 81,040.80, 111,713.76 and 63,104.16

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Solution

The fourth proportional to 81,040.80, 111,713.76 and 63,104.16 is: 86,988.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,040.80 : 111,713.76 = 63,104.16 : x
  2. Step 2: Convert to fraction form
    81,040.80/111,713.76 = 63,104.16/x
  3. Step 3: Cross multiply
    81,040.80x = 111,713.76 × 63,104.16
  4. Step 4: Simplify right side
    81,040.80x = 7,049,602,985.24
  5. Step 5: Solve for x
    x = 7,049,602,985.24/81,040.80
  6. Step 6: Final answer
    x = 86,988.32

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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.