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Finding the Fourth Proportional to 86,490.72, 129,753.63 and 36,570.69

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Solution

The fourth proportional to 86,490.72, 129,753.63 and 36,570.69 is: 54,863.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,490.72 : 129,753.63 = 36,570.69 : x
  2. Step 2: Convert to fraction form
    86,490.72/129,753.63 = 36,570.69/x
  3. Step 3: Cross multiply
    86,490.72x = 129,753.63 × 36,570.69
  4. Step 4: Simplify right side
    86,490.72x = 4,745,179,779.10
  5. Step 5: Solve for x
    x = 4,745,179,779.10/86,490.72
  6. Step 6: Final answer
    x = 54,863.46

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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.