Home / 85,465.20-128,197.80-75,623.70

Finding the Fourth Proportional to 85,465.20, 128,197.80 and 75,623.70

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Solution

The fourth proportional to 85,465.20, 128,197.80 and 75,623.70 is: 113,435.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,465.20 : 128,197.80 = 75,623.70 : x
  2. Step 2: Convert to fraction form
    85,465.20/128,197.80 = 75,623.70/x
  3. Step 3: Cross multiply
    85,465.20x = 128,197.80 × 75,623.70
  4. Step 4: Simplify right side
    85,465.20x = 9,694,791,967.86
  5. Step 5: Solve for x
    x = 9,694,791,967.86/85,465.20
  6. Step 6: Final answer
    x = 113,435.55

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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.