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Finding the Fourth Proportional to 86,570.31, 129,862.87 and 30,405.53

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Solution

The fourth proportional to 86,570.31, 129,862.87 and 30,405.53 is: 45,610.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,570.31 : 129,862.87 = 30,405.53 : x
  2. Step 2: Convert to fraction form
    86,570.31/129,862.87 = 30,405.53/x
  3. Step 3: Cross multiply
    86,570.31x = 129,862.87 × 30,405.53
  4. Step 4: Simplify right side
    86,570.31x = 3,948,549,389.67
  5. Step 5: Solve for x
    x = 3,948,549,389.67/86,570.31
  6. Step 6: Final answer
    x = 45,610.90

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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.