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Finding the Fourth Proportional to 388.55, 581.45 and 278.97

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Solution

The fourth proportional to 388.55, 581.45 and 278.97 is: 417.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.55 : 581.45 = 278.97 : x
  2. Step 2: Convert to fraction form
    388.55/581.45 = 278.97/x
  3. Step 3: Cross multiply
    388.55x = 581.45 × 278.97
  4. Step 4: Simplify right side
    388.55x = 162,205.71
  5. Step 5: Solve for x
    x = 162,205.71/388.55
  6. Step 6: Final answer
    x = 417.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.