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Finding the Fourth Proportional to 28,978.02, 40,001.98 and 18,915.10

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Solution

The fourth proportional to 28,978.02, 40,001.98 and 18,915.10 is: 26,110.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.02 : 40,001.98 = 18,915.10 : x
  2. Step 2: Convert to fraction form
    28,978.02/40,001.98 = 18,915.10/x
  3. Step 3: Cross multiply
    28,978.02x = 40,001.98 × 18,915.10
  4. Step 4: Simplify right side
    28,978.02x = 756,641,451.90
  5. Step 5: Solve for x
    x = 756,641,451.90/28,978.02
  6. Step 6: Final answer
    x = 26,110.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.