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Finding the Fourth Proportional to 402.84, 554.40 and 286.20

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Solution

The fourth proportional to 402.84, 554.40 and 286.20 is: 393.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.84 : 554.40 = 286.20 : x
  2. Step 2: Convert to fraction form
    402.84/554.40 = 286.20/x
  3. Step 3: Cross multiply
    402.84x = 554.40 × 286.20
  4. Step 4: Simplify right side
    402.84x = 158,669.28
  5. Step 5: Solve for x
    x = 158,669.28/402.84
  6. Step 6: Final answer
    x = 393.88

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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.