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Finding the Fourth Proportional to 85,808.80, 129,058.80 and 76,823.20

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Solution

The fourth proportional to 85,808.80, 129,058.80 and 76,823.20 is: 115,544.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,808.80 : 129,058.80 = 76,823.20 : x
  2. Step 2: Convert to fraction form
    85,808.80/129,058.80 = 76,823.20/x
  3. Step 3: Cross multiply
    85,808.80x = 129,058.80 × 76,823.20
  4. Step 4: Simplify right side
    85,808.80x = 9,914,710,004.16
  5. Step 5: Solve for x
    x = 9,914,710,004.16/85,808.80
  6. Step 6: Final answer
    x = 115,544.21

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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.