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Finding the Fourth Proportional to 85,689.08, 128,559.87 and 38,344.01

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Solution

The fourth proportional to 85,689.08, 128,559.87 and 38,344.01 is: 57,527.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,689.08 : 128,559.87 = 38,344.01 : x
  2. Step 2: Convert to fraction form
    85,689.08/128,559.87 = 38,344.01/x
  3. Step 3: Cross multiply
    85,689.08x = 128,559.87 × 38,344.01
  4. Step 4: Simplify right side
    85,689.08x = 4,929,501,262.28
  5. Step 5: Solve for x
    x = 4,929,501,262.28/85,689.08
  6. Step 6: Final answer
    x = 57,527.77

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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.