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Finding the Fourth Proportional to 85,980.60, 128,235.84 and 75,519.45

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Solution

The fourth proportional to 85,980.60, 128,235.84 and 75,519.45 is: 112,633.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.60 : 128,235.84 = 75,519.45 : x
  2. Step 2: Convert to fraction form
    85,980.60/128,235.84 = 75,519.45/x
  3. Step 3: Cross multiply
    85,980.60x = 128,235.84 × 75,519.45
  4. Step 4: Simplify right side
    85,980.60x = 9,684,300,107.09
  5. Step 5: Solve for x
    x = 9,684,300,107.09/85,980.60
  6. Step 6: Final answer
    x = 112,633.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.