Home / 85,431.35-128,147.03-81,154.55

Finding the Fourth Proportional to 85,431.35, 128,147.03 and 81,154.55

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Solution

The fourth proportional to 85,431.35, 128,147.03 and 81,154.55 is: 121,731.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,431.35 : 128,147.03 = 81,154.55 : x
  2. Step 2: Convert to fraction form
    85,431.35/128,147.03 = 81,154.55/x
  3. Step 3: Cross multiply
    85,431.35x = 128,147.03 × 81,154.55
  4. Step 4: Simplify right side
    85,431.35x = 10,399,714,147.71
  5. Step 5: Solve for x
    x = 10,399,714,147.71/85,431.35
  6. Step 6: Final answer
    x = 121,731.83

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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.