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Finding the Fourth Proportional to 872.85, 1,308.78 and 353.10

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Solution

The fourth proportional to 872.85, 1,308.78 and 353.10 is: 529.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.85 : 1,308.78 = 353.10 : x
  2. Step 2: Convert to fraction form
    872.85/1,308.78 = 353.10/x
  3. Step 3: Cross multiply
    872.85x = 1,308.78 × 353.10
  4. Step 4: Simplify right side
    872.85x = 462,130.22
  5. Step 5: Solve for x
    x = 462,130.22/872.85
  6. Step 6: Final answer
    x = 529.45

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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.