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Finding the Fourth Proportional to 8,418.74, 12,619.29 and 2,870.13

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Solution

The fourth proportional to 8,418.74, 12,619.29 and 2,870.13 is: 4,302.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,418.74 : 12,619.29 = 2,870.13 : x
  2. Step 2: Convert to fraction form
    8,418.74/12,619.29 = 2,870.13/x
  3. Step 3: Cross multiply
    8,418.74x = 12,619.29 × 2,870.13
  4. Step 4: Simplify right side
    8,418.74x = 36,219,060.89
  5. Step 5: Solve for x
    x = 36,219,060.89/8,418.74
  6. Step 6: Final answer
    x = 4,302.20

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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.