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Finding the Fourth Proportional to 8,560.80, 12,812.40 and 7,869.60

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Solution

The fourth proportional to 8,560.80, 12,812.40 and 7,869.60 is: 11,777.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,560.80 : 12,812.40 = 7,869.60 : x
  2. Step 2: Convert to fraction form
    8,560.80/12,812.40 = 7,869.60/x
  3. Step 3: Cross multiply
    8,560.80x = 12,812.40 × 7,869.60
  4. Step 4: Simplify right side
    8,560.80x = 100,828,463.04
  5. Step 5: Solve for x
    x = 100,828,463.04/8,560.80
  6. Step 6: Final answer
    x = 11,777.93

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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.