Home / 107,921.10-161,881.65-85,613.70

Finding the Fourth Proportional to 107,921.10, 161,881.65 and 85,613.70

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Solution

The fourth proportional to 107,921.10, 161,881.65 and 85,613.70 is: 128,420.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,921.10 : 161,881.65 = 85,613.70 : x
  2. Step 2: Convert to fraction form
    107,921.10/161,881.65 = 85,613.70/x
  3. Step 3: Cross multiply
    107,921.10x = 161,881.65 × 85,613.70
  4. Step 4: Simplify right side
    107,921.10x = 13,859,287,018.61
  5. Step 5: Solve for x
    x = 13,859,287,018.61/107,921.10
  6. Step 6: Final answer
    x = 128,420.55

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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.