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Finding the Fourth Proportional to 927.80, 1,391.28 and 278.40

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Solution

The fourth proportional to 927.80, 1,391.28 and 278.40 is: 417.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.80 : 1,391.28 = 278.40 : x
  2. Step 2: Convert to fraction form
    927.80/1,391.28 = 278.40/x
  3. Step 3: Cross multiply
    927.80x = 1,391.28 × 278.40
  4. Step 4: Simplify right side
    927.80x = 387,332.35
  5. Step 5: Solve for x
    x = 387,332.35/927.80
  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.