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Finding the Fourth Proportional to 70,352.28, 105,531.32 and 20,432.36

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Solution

The fourth proportional to 70,352.28, 105,531.32 and 20,432.36 is: 30,649.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,352.28 : 105,531.32 = 20,432.36 : x
  2. Step 2: Convert to fraction form
    70,352.28/105,531.32 = 20,432.36/x
  3. Step 3: Cross multiply
    70,352.28x = 105,531.32 × 20,432.36
  4. Step 4: Simplify right side
    70,352.28x = 2,156,253,921.52
  5. Step 5: Solve for x
    x = 2,156,253,921.52/70,352.28
  6. Step 6: Final answer
    x = 30,649.38

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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.