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Finding the Fourth Proportional to 87,061.84, 130,745.88 and 85,815.25

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Solution

The fourth proportional to 87,061.84, 130,745.88 and 85,815.25 is: 128,873.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,061.84 : 130,745.88 = 85,815.25 : x
  2. Step 2: Convert to fraction form
    87,061.84/130,745.88 = 85,815.25/x
  3. Step 3: Cross multiply
    87,061.84x = 130,745.88 × 85,815.25
  4. Step 4: Simplify right side
    87,061.84x = 11,219,990,051.81
  5. Step 5: Solve for x
    x = 11,219,990,051.81/87,061.84
  6. Step 6: Final answer
    x = 128,873.80

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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.