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Finding the Fourth Proportional to 85,114.80, 128,309.58 and 79,405.92

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Solution

The fourth proportional to 85,114.80, 128,309.58 and 79,405.92 is: 119,703.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,114.80 : 128,309.58 = 79,405.92 : x
  2. Step 2: Convert to fraction form
    85,114.80/128,309.58 = 79,405.92/x
  3. Step 3: Cross multiply
    85,114.80x = 128,309.58 × 79,405.92
  4. Step 4: Simplify right side
    85,114.80x = 10,188,540,244.71
  5. Step 5: Solve for x
    x = 10,188,540,244.71/85,114.80
  6. Step 6: Final answer
    x = 119,703.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.