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Finding the Fourth Proportional to 553.33, 763.55 and 304.66

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Solution

The fourth proportional to 553.33, 763.55 and 304.66 is: 420.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.33 : 763.55 = 304.66 : x
  2. Step 2: Convert to fraction form
    553.33/763.55 = 304.66/x
  3. Step 3: Cross multiply
    553.33x = 763.55 × 304.66
  4. Step 4: Simplify right side
    553.33x = 232,617.80
  5. Step 5: Solve for x
    x = 232,617.80/553.33
  6. Step 6: Final answer
    x = 420.40

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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.