Home / 100,639.18-138,885.42-55,318.78

Finding the Fourth Proportional to 100,639.18, 138,885.42 and 55,318.78

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Solution

The fourth proportional to 100,639.18, 138,885.42 and 55,318.78 is: 76,341.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,639.18 : 138,885.42 = 55,318.78 : x
  2. Step 2: Convert to fraction form
    100,639.18/138,885.42 = 55,318.78/x
  3. Step 3: Cross multiply
    100,639.18x = 138,885.42 × 55,318.78
  4. Step 4: Simplify right side
    100,639.18x = 7,682,971,994.19
  5. Step 5: Solve for x
    x = 7,682,971,994.19/100,639.18
  6. Step 6: Final answer
    x = 76,341.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.