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Finding the Fourth Proportional to 28,479.97, 42,719.96 and 7,419.95

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Solution

The fourth proportional to 28,479.97, 42,719.96 and 7,419.95 is: 11,129.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.97 : 42,719.96 = 7,419.95 : x
  2. Step 2: Convert to fraction form
    28,479.97/42,719.96 = 7,419.95/x
  3. Step 3: Cross multiply
    28,479.97x = 42,719.96 × 7,419.95
  4. Step 4: Simplify right side
    28,479.97x = 316,979,967.20
  5. Step 5: Solve for x
    x = 316,979,967.20/28,479.97
  6. Step 6: Final answer
    x = 11,129.93

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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.