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Finding the Fourth Proportional to 70,101.20, 105,151.79 and 20,853.20

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Solution

The fourth proportional to 70,101.20, 105,151.79 and 20,853.20 is: 31,279.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,101.20 : 105,151.79 = 20,853.20 : x
  2. Step 2: Convert to fraction form
    70,101.20/105,151.79 = 20,853.20/x
  3. Step 3: Cross multiply
    70,101.20x = 105,151.79 × 20,853.20
  4. Step 4: Simplify right side
    70,101.20x = 2,192,750,677.20
  5. Step 5: Solve for x
    x = 2,192,750,677.20/70,101.20
  6. Step 6: Final answer
    x = 31,279.79

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1.5x scale

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.