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Finding the Fourth Proportional to 81,018, 121,520.88 and 28,431

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Solution

The fourth proportional to 81,018, 121,520.88 and 28,431 is: 42,644.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,018 : 121,520.88 = 28,431 : x
  2. Step 2: Convert to fraction form
    81,018/121,520.88 = 28,431/x
  3. Step 3: Cross multiply
    81,018x = 121,520.88 × 28,431
  4. Step 4: Simplify right side
    81,018x = 3,454,960,139.28
  5. Step 5: Solve for x
    x = 3,454,960,139.28/81,018
  6. Step 6: Final answer
    x = 42,644.35

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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.