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Finding the Fourth Proportional to 85,690.70, 128,536.05 and 72,601.10

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Solution

The fourth proportional to 85,690.70, 128,536.05 and 72,601.10 is: 108,901.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,690.70 : 128,536.05 = 72,601.10 : x
  2. Step 2: Convert to fraction form
    85,690.70/128,536.05 = 72,601.10/x
  3. Step 3: Cross multiply
    85,690.70x = 128,536.05 × 72,601.10
  4. Step 4: Simplify right side
    85,690.70x = 9,331,858,619.66
  5. Step 5: Solve for x
    x = 9,331,858,619.66/85,690.70
  6. Step 6: Final answer
    x = 108,901.65

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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.