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Finding the Fourth Proportional to 609.84, 909.72 and 553.92

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Solution

The fourth proportional to 609.84, 909.72 and 553.92 is: 826.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.84 : 909.72 = 553.92 : x
  2. Step 2: Convert to fraction form
    609.84/909.72 = 553.92/x
  3. Step 3: Cross multiply
    609.84x = 909.72 × 553.92
  4. Step 4: Simplify right side
    609.84x = 503,912.10
  5. Step 5: Solve for x
    x = 503,912.10/609.84
  6. Step 6: Final answer
    x = 826.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.