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Finding the Fourth Proportional to 898.23, 1,239.54 and 520.17

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Solution

The fourth proportional to 898.23, 1,239.54 and 520.17 is: 717.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.23 : 1,239.54 = 520.17 : x
  2. Step 2: Convert to fraction form
    898.23/1,239.54 = 520.17/x
  3. Step 3: Cross multiply
    898.23x = 1,239.54 × 520.17
  4. Step 4: Simplify right side
    898.23x = 644,771.52
  5. Step 5: Solve for x
    x = 644,771.52/898.23
  6. Step 6: Final answer
    x = 717.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.