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Finding the Fourth Proportional to 70,442.88, 105,680.70 and 20,528.28

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Solution

The fourth proportional to 70,442.88, 105,680.70 and 20,528.28 is: 30,797.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,442.88 : 105,680.70 = 20,528.28 : x
  2. Step 2: Convert to fraction form
    70,442.88/105,680.70 = 20,528.28/x
  3. Step 3: Cross multiply
    70,442.88x = 105,680.70 × 20,528.28
  4. Step 4: Simplify right side
    70,442.88x = 2,169,443,000.20
  5. Step 5: Solve for x
    x = 2,169,443,000.20/70,442.88
  6. Step 6: Final answer
    x = 30,797.19

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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.