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Finding the Fourth Proportional to 85,470.80, 128,178.84 and 28,532.48

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Solution

The fourth proportional to 85,470.80, 128,178.84 and 28,532.48 is: 42,789.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,470.80 : 128,178.84 = 28,532.48 : x
  2. Step 2: Convert to fraction form
    85,470.80/128,178.84 = 28,532.48/x
  3. Step 3: Cross multiply
    85,470.80x = 128,178.84 × 28,532.48
  4. Step 4: Simplify right side
    85,470.80x = 3,657,260,188.72
  5. Step 5: Solve for x
    x = 3,657,260,188.72/85,470.80
  6. Step 6: Final answer
    x = 42,789.59

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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.