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Finding the Fourth Proportional to 8,390.75, 12,585.31 and 2,547.41

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Solution

The fourth proportional to 8,390.75, 12,585.31 and 2,547.41 is: 3,820.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.75 : 12,585.31 = 2,547.41 : x
  2. Step 2: Convert to fraction form
    8,390.75/12,585.31 = 2,547.41/x
  3. Step 3: Cross multiply
    8,390.75x = 12,585.31 × 2,547.41
  4. Step 4: Simplify right side
    8,390.75x = 32,059,875.25
  5. Step 5: Solve for x
    x = 32,059,875.25/8,390.75
  6. Step 6: Final answer
    x = 3,820.86

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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.