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Finding the Fourth Proportional to 898.90, 1,348.17 and 321.64

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Solution

The fourth proportional to 898.90, 1,348.17 and 321.64 is: 482.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.90 : 1,348.17 = 321.64 : x
  2. Step 2: Convert to fraction form
    898.90/1,348.17 = 321.64/x
  3. Step 3: Cross multiply
    898.90x = 1,348.17 × 321.64
  4. Step 4: Simplify right side
    898.90x = 433,625.40
  5. Step 5: Solve for x
    x = 433,625.40/898.90
  6. Step 6: Final answer
    x = 482.40

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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.