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Finding the Fourth Proportional to 89,878.80, 134,643.06 and 54,731.28

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Solution

The fourth proportional to 89,878.80, 134,643.06 and 54,731.28 is: 81,990.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,878.80 : 134,643.06 = 54,731.28 : x
  2. Step 2: Convert to fraction form
    89,878.80/134,643.06 = 54,731.28/x
  3. Step 3: Cross multiply
    89,878.80x = 134,643.06 × 54,731.28
  4. Step 4: Simplify right side
    89,878.80x = 7,369,187,016.92
  5. Step 5: Solve for x
    x = 7,369,187,016.92/89,878.80
  6. Step 6: Final answer
    x = 81,990.27

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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.