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Finding the Fourth Proportional to 9,309.40, 13,947.90 and 7,851.40

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Solution

The fourth proportional to 9,309.40, 13,947.90 and 7,851.40 is: 11,763.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,309.40 : 13,947.90 = 7,851.40 : x
  2. Step 2: Convert to fraction form
    9,309.40/13,947.90 = 7,851.40/x
  3. Step 3: Cross multiply
    9,309.40x = 13,947.90 × 7,851.40
  4. Step 4: Simplify right side
    9,309.40x = 109,510,542.06
  5. Step 5: Solve for x
    x = 109,510,542.06/9,309.40
  6. Step 6: Final answer
    x = 11,763.44

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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.