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Finding the Fourth Proportional to 12,685.80, 17,505.76 and 7,020.43

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Solution

The fourth proportional to 12,685.80, 17,505.76 and 7,020.43 is: 9,687.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,685.80 : 17,505.76 = 7,020.43 : x
  2. Step 2: Convert to fraction form
    12,685.80/17,505.76 = 7,020.43/x
  3. Step 3: Cross multiply
    12,685.80x = 17,505.76 × 7,020.43
  4. Step 4: Simplify right side
    12,685.80x = 122,897,962.68
  5. Step 5: Solve for x
    x = 122,897,962.68/12,685.80
  6. Step 6: Final answer
    x = 9,687.84

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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.