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Finding the Fourth Proportional to 87,111.90, 130,667.85 and 69,615.90

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Solution

The fourth proportional to 87,111.90, 130,667.85 and 69,615.90 is: 104,423.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,111.90 : 130,667.85 = 69,615.90 : x
  2. Step 2: Convert to fraction form
    87,111.90/130,667.85 = 69,615.90/x
  3. Step 3: Cross multiply
    87,111.90x = 130,667.85 × 69,615.90
  4. Step 4: Simplify right side
    87,111.90x = 9,096,559,978.82
  5. Step 5: Solve for x
    x = 9,096,559,978.82/87,111.90
  6. Step 6: Final answer
    x = 104,423.85

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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.