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Finding the Fourth Proportional to 12,685.54, 17,505.84 and 7,019.86

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Solution

The fourth proportional to 12,685.54, 17,505.84 and 7,019.86 is: 9,687.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,685.54 : 17,505.84 = 7,019.86 : x
  2. Step 2: Convert to fraction form
    12,685.54/17,505.84 = 7,019.86/x
  3. Step 3: Cross multiply
    12,685.54x = 17,505.84 × 7,019.86
  4. Step 4: Simplify right side
    12,685.54x = 122,888,545.98
  5. Step 5: Solve for x
    x = 122,888,545.98/12,685.54
  6. Step 6: Final answer
    x = 9,687.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.