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Finding the Fourth Proportional to 85,842.60, 128,763.90 and 79,621.80

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Solution

The fourth proportional to 85,842.60, 128,763.90 and 79,621.80 is: 119,432.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,842.60 : 128,763.90 = 79,621.80 : x
  2. Step 2: Convert to fraction form
    85,842.60/128,763.90 = 79,621.80/x
  3. Step 3: Cross multiply
    85,842.60x = 128,763.90 × 79,621.80
  4. Step 4: Simplify right side
    85,842.60x = 10,252,413,493.02
  5. Step 5: Solve for x
    x = 10,252,413,493.02/85,842.60
  6. Step 6: Final answer
    x = 119,432.70

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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.