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Finding the Fourth Proportional to 402.48, 555.12 and 278.28

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Solution

The fourth proportional to 402.48, 555.12 and 278.28 is: 383.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.48 : 555.12 = 278.28 : x
  2. Step 2: Convert to fraction form
    402.48/555.12 = 278.28/x
  3. Step 3: Cross multiply
    402.48x = 555.12 × 278.28
  4. Step 4: Simplify right side
    402.48x = 154,478.79
  5. Step 5: Solve for x
    x = 154,478.79/402.48
  6. Step 6: Final answer
    x = 383.82

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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.