Home / 100,688.12-138,938.04-80,537.72

Finding the Fourth Proportional to 100,688.12, 138,938.04 and 80,537.72

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Solution

The fourth proportional to 100,688.12, 138,938.04 and 80,537.72 is: 111,132.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,688.12 : 138,938.04 = 80,537.72 : x
  2. Step 2: Convert to fraction form
    100,688.12/138,938.04 = 80,537.72/x
  3. Step 3: Cross multiply
    100,688.12x = 138,938.04 × 80,537.72
  4. Step 4: Simplify right side
    100,688.12x = 11,189,752,962.87
  5. Step 5: Solve for x
    x = 11,189,752,962.87/100,688.12
  6. Step 6: Final answer
    x = 111,132.80

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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.