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Finding the Fourth Proportional to 553.61, 763.85 and 479.80

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Solution

The fourth proportional to 553.61, 763.85 and 479.80 is: 662.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.61 : 763.85 = 479.80 : x
  2. Step 2: Convert to fraction form
    553.61/763.85 = 479.80/x
  3. Step 3: Cross multiply
    553.61x = 763.85 × 479.80
  4. Step 4: Simplify right side
    553.61x = 366,495.23
  5. Step 5: Solve for x
    x = 366,495.23/553.61
  6. Step 6: Final answer
    x = 662.01

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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.