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Finding the Fourth Proportional to 28,978.14, 40,002.13 and 18,915.20

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Solution

The fourth proportional to 28,978.14, 40,002.13 and 18,915.20 is: 26,111.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.14 : 40,002.13 = 18,915.20 : x
  2. Step 2: Convert to fraction form
    28,978.14/40,002.13 = 18,915.20/x
  3. Step 3: Cross multiply
    28,978.14x = 40,002.13 × 18,915.20
  4. Step 4: Simplify right side
    28,978.14x = 756,648,434.83
  5. Step 5: Solve for x
    x = 756,648,434.83/28,978.14
  6. Step 6: Final answer
    x = 26,111.01

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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.