Home / 100,142.46-138,231.36-61,931.25

Finding the Fourth Proportional to 100,142.46, 138,231.36 and 61,931.25

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Solution

The fourth proportional to 100,142.46, 138,231.36 and 61,931.25 is: 85,486.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,142.46 : 138,231.36 = 61,931.25 : x
  2. Step 2: Convert to fraction form
    100,142.46/138,231.36 = 61,931.25/x
  3. Step 3: Cross multiply
    100,142.46x = 138,231.36 × 61,931.25
  4. Step 4: Simplify right side
    100,142.46x = 8,560,840,914.00
  5. Step 5: Solve for x
    x = 8,560,840,914.00/100,142.46
  6. Step 6: Final answer
    x = 85,486.62

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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.