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Finding the Fourth Proportional to 71,908.98, 107,856.18 and 19,311.63

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Solution

The fourth proportional to 71,908.98, 107,856.18 and 19,311.63 is: 28,965.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,908.98 : 107,856.18 = 19,311.63 : x
  2. Step 2: Convert to fraction form
    71,908.98/107,856.18 = 19,311.63/x
  3. Step 3: Cross multiply
    71,908.98x = 107,856.18 × 19,311.63
  4. Step 4: Simplify right side
    71,908.98x = 2,082,878,641.37
  5. Step 5: Solve for x
    x = 2,082,878,641.37/71,908.98
  6. Step 6: Final answer
    x = 28,965.49

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Double scale
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Similar ratio
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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.