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Finding the Fourth Proportional to 9,239.80, 12,759.90 and 7,905.70

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Solution

The fourth proportional to 9,239.80, 12,759.90 and 7,905.70 is: 10,917.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,239.80 : 12,759.90 = 7,905.70 : x
  2. Step 2: Convert to fraction form
    9,239.80/12,759.90 = 7,905.70/x
  3. Step 3: Cross multiply
    9,239.80x = 12,759.90 × 7,905.70
  4. Step 4: Simplify right side
    9,239.80x = 100,875,941.43
  5. Step 5: Solve for x
    x = 100,875,941.43/9,239.80
  6. Step 6: Final answer
    x = 10,917.55

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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.