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Finding the Fourth Proportional to 100,421.76, 150,431.82 and 60,418.68

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Solution

The fourth proportional to 100,421.76, 150,431.82 and 60,418.68 is: 90,507.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,421.76 : 150,431.82 = 60,418.68 : x
  2. Step 2: Convert to fraction form
    100,421.76/150,431.82 = 60,418.68/x
  3. Step 3: Cross multiply
    100,421.76x = 150,431.82 × 60,418.68
  4. Step 4: Simplify right side
    100,421.76x = 9,088,891,994.40
  5. Step 5: Solve for x
    x = 9,088,891,994.40/100,421.76
  6. Step 6: Final answer
    x = 90,507.20

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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.