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Finding the Fourth Proportional to 70,122.17, 105,242.70 and 28,031.97

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Solution

The fourth proportional to 70,122.17, 105,242.70 and 28,031.97 is: 42,071.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,122.17 : 105,242.70 = 28,031.97 : x
  2. Step 2: Convert to fraction form
    70,122.17/105,242.70 = 28,031.97/x
  3. Step 3: Cross multiply
    70,122.17x = 105,242.70 × 28,031.97
  4. Step 4: Simplify right side
    70,122.17x = 2,950,160,209.12
  5. Step 5: Solve for x
    x = 2,950,160,209.12/70,122.17
  6. Step 6: Final answer
    x = 42,071.72

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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.