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Finding the Fourth Proportional to 8,671.80, 13,008.78 and 3,124.20

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Solution

The fourth proportional to 8,671.80, 13,008.78 and 3,124.20 is: 4,686.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,671.80 : 13,008.78 = 3,124.20 : x
  2. Step 2: Convert to fraction form
    8,671.80/13,008.78 = 3,124.20/x
  3. Step 3: Cross multiply
    8,671.80x = 13,008.78 × 3,124.20
  4. Step 4: Simplify right side
    8,671.80x = 40,642,030.48
  5. Step 5: Solve for x
    x = 40,642,030.48/8,671.80
  6. Step 6: Final answer
    x = 4,686.69

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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.