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Finding the Fourth Proportional to 28,432, 42,648 and 7,655.50

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Solution

The fourth proportional to 28,432, 42,648 and 7,655.50 is: 11,483.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,432 : 42,648 = 7,655.50 : x
  2. Step 2: Convert to fraction form
    28,432/42,648 = 7,655.50/x
  3. Step 3: Cross multiply
    28,432x = 42,648 × 7,655.50
  4. Step 4: Simplify right side
    28,432x = 326,491,764
  5. Step 5: Solve for x
    x = 326,491,764/28,432
  6. Step 6: Final answer
    x = 11,483.25

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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.