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Finding the Fourth Proportional to 8,662.74, 12,931.45 and 7,611.80

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Solution

The fourth proportional to 8,662.74, 12,931.45 and 7,611.80 is: 11,362.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,662.74 : 12,931.45 = 7,611.80 : x
  2. Step 2: Convert to fraction form
    8,662.74/12,931.45 = 7,611.80/x
  3. Step 3: Cross multiply
    8,662.74x = 12,931.45 × 7,611.80
  4. Step 4: Simplify right side
    8,662.74x = 98,431,604.46
  5. Step 5: Solve for x
    x = 98,431,604.46/8,662.74
  6. Step 6: Final answer
    x = 11,362.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.