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Finding the Fourth Proportional to 8,685.80, 11,981.00 and 5,146.50

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Solution

The fourth proportional to 8,685.80, 11,981.00 and 5,146.50 is: 7,098.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.80 : 11,981.00 = 5,146.50 : x
  2. Step 2: Convert to fraction form
    8,685.80/11,981.00 = 5,146.50/x
  3. Step 3: Cross multiply
    8,685.80x = 11,981.00 × 5,146.50
  4. Step 4: Simplify right side
    8,685.80x = 61,660,190.77
  5. Step 5: Solve for x
    x = 61,660,190.77/8,685.80
  6. Step 6: Final answer
    x = 7,098.97

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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.