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Finding the Fourth Proportional to 898.57, 1,347.63 and 321.45

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Solution

The fourth proportional to 898.57, 1,347.63 and 321.45 is: 482.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.57 : 1,347.63 = 321.45 : x
  2. Step 2: Convert to fraction form
    898.57/1,347.63 = 321.45/x
  3. Step 3: Cross multiply
    898.57x = 1,347.63 × 321.45
  4. Step 4: Simplify right side
    898.57x = 433,195.66
  5. Step 5: Solve for x
    x = 433,195.66/898.57
  6. Step 6: Final answer
    x = 482.09

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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.