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Finding the Fourth Proportional to 9,877.80, 13,639.20 and 7,791.24

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Solution

The fourth proportional to 9,877.80, 13,639.20 and 7,791.24 is: 10,758.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,877.80 : 13,639.20 = 7,791.24 : x
  2. Step 2: Convert to fraction form
    9,877.80/13,639.20 = 7,791.24/x
  3. Step 3: Cross multiply
    9,877.80x = 13,639.20 × 7,791.24
  4. Step 4: Simplify right side
    9,877.80x = 106,266,280.61
  5. Step 5: Solve for x
    x = 106,266,280.61/9,877.80
  6. Step 6: Final answer
    x = 10,758.09

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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.