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Finding the Fourth Proportional to 6,601.80, 9,888.30 and 5,129.40

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Solution

The fourth proportional to 6,601.80, 9,888.30 and 5,129.40 is: 7,682.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,601.80 : 9,888.30 = 5,129.40 : x
  2. Step 2: Convert to fraction form
    6,601.80/9,888.30 = 5,129.40/x
  3. Step 3: Cross multiply
    6,601.80x = 9,888.30 × 5,129.40
  4. Step 4: Simplify right side
    6,601.80x = 50,721,046.02
  5. Step 5: Solve for x
    x = 50,721,046.02/6,601.80
  6. Step 6: Final answer
    x = 7,682.91

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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.