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Finding the Fourth Proportional to 85,470.76, 128,170.14 and 34,855.72

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Solution

The fourth proportional to 85,470.76, 128,170.14 and 34,855.72 is: 52,268.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,470.76 : 128,170.14 = 34,855.72 : x
  2. Step 2: Convert to fraction form
    85,470.76/128,170.14 = 34,855.72/x
  3. Step 3: Cross multiply
    85,470.76x = 128,170.14 × 34,855.72
  4. Step 4: Simplify right side
    85,470.76x = 4,467,462,512.20
  5. Step 5: Solve for x
    x = 4,467,462,512.20/85,470.76
  6. Step 6: Final answer
    x = 52,268.90

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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.