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Finding the Fourth Proportional to 85,689.96, 128,541.06 and 26,518.02

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Solution

The fourth proportional to 85,689.96, 128,541.06 and 26,518.02 is: 39,778.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,689.96 : 128,541.06 = 26,518.02 : x
  2. Step 2: Convert to fraction form
    85,689.96/128,541.06 = 26,518.02/x
  3. Step 3: Cross multiply
    85,689.96x = 128,541.06 × 26,518.02
  4. Step 4: Simplify right side
    85,689.96x = 3,408,654,399.90
  5. Step 5: Solve for x
    x = 3,408,654,399.90/85,689.96
  6. Step 6: Final answer
    x = 39,778.92

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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.