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Finding the Fourth Proportional to 28,478.97, 42,718.46 and 7,418.95

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Solution

The fourth proportional to 28,478.97, 42,718.46 and 7,418.95 is: 11,128.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.97 : 42,718.46 = 7,418.95 : x
  2. Step 2: Convert to fraction form
    28,478.97/42,718.46 = 7,418.95/x
  3. Step 3: Cross multiply
    28,478.97x = 42,718.46 × 7,418.95
  4. Step 4: Simplify right side
    28,478.97x = 316,926,137.36
  5. Step 5: Solve for x
    x = 316,926,137.36/28,478.97
  6. Step 6: Final answer
    x = 11,128.43

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.