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Finding the Fourth Proportional to 85,672.70, 128,451.45 and 45,698.30

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Solution

The fourth proportional to 85,672.70, 128,451.45 and 45,698.30 is: 68,516.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,672.70 : 128,451.45 = 45,698.30 : x
  2. Step 2: Convert to fraction form
    85,672.70/128,451.45 = 45,698.30/x
  3. Step 3: Cross multiply
    85,672.70x = 128,451.45 × 45,698.30
  4. Step 4: Simplify right side
    85,672.70x = 5,870,012,897.54
  5. Step 5: Solve for x
    x = 5,870,012,897.54/85,672.70
  6. Step 6: Final answer
    x = 68,516.73

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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.