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Finding the Fourth Proportional to 8,785.40, 13,179.90 and 2,946.20

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Solution

The fourth proportional to 8,785.40, 13,179.90 and 2,946.20 is: 4,419.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,785.40 : 13,179.90 = 2,946.20 : x
  2. Step 2: Convert to fraction form
    8,785.40/13,179.90 = 2,946.20/x
  3. Step 3: Cross multiply
    8,785.40x = 13,179.90 × 2,946.20
  4. Step 4: Simplify right side
    8,785.40x = 38,830,621.38
  5. Step 5: Solve for x
    x = 38,830,621.38/8,785.40
  6. Step 6: Final answer
    x = 4,419.90

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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.