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Finding the Fourth Proportional to 402.64, 555.33 and 278.50

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Solution

The fourth proportional to 402.64, 555.33 and 278.50 is: 384.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.64 : 555.33 = 278.50 : x
  2. Step 2: Convert to fraction form
    402.64/555.33 = 278.50/x
  3. Step 3: Cross multiply
    402.64x = 555.33 × 278.50
  4. Step 4: Simplify right side
    402.64x = 154,658.01
  5. Step 5: Solve for x
    x = 154,658.01/402.64
  6. Step 6: Final answer
    x = 384.11

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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.