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Finding the Fourth Proportional to 71,431.76, 107,135.40 and 18,841.76

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Solution

The fourth proportional to 71,431.76, 107,135.40 and 18,841.76 is: 28,259.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,431.76 : 107,135.40 = 18,841.76 : x
  2. Step 2: Convert to fraction form
    71,431.76/107,135.40 = 18,841.76/x
  3. Step 3: Cross multiply
    71,431.76x = 107,135.40 × 18,841.76
  4. Step 4: Simplify right side
    71,431.76x = 2,018,619,494.30
  5. Step 5: Solve for x
    x = 2,018,619,494.30/71,431.76
  6. Step 6: Final answer
    x = 28,259.41

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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.