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Finding the Fourth Proportional to 89,999.90, 134,999.85 and 86,543.90

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Solution

The fourth proportional to 89,999.90, 134,999.85 and 86,543.90 is: 129,815.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,999.90 : 134,999.85 = 86,543.90 : x
  2. Step 2: Convert to fraction form
    89,999.90/134,999.85 = 86,543.90/x
  3. Step 3: Cross multiply
    89,999.90x = 134,999.85 × 86,543.90
  4. Step 4: Simplify right side
    89,999.90x = 11,683,413,518.42
  5. Step 5: Solve for x
    x = 11,683,413,518.42/89,999.90
  6. Step 6: Final answer
    x = 129,815.85

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1.5x scale

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.