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Finding the Fourth Proportional to 872.57, 1,308.80 and 410.45

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Solution

The fourth proportional to 872.57, 1,308.80 and 410.45 is: 615.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.57 : 1,308.80 = 410.45 : x
  2. Step 2: Convert to fraction form
    872.57/1,308.80 = 410.45/x
  3. Step 3: Cross multiply
    872.57x = 1,308.80 × 410.45
  4. Step 4: Simplify right side
    872.57x = 537,196.96
  5. Step 5: Solve for x
    x = 537,196.96/872.57
  6. Step 6: Final answer
    x = 615.65

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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.