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Finding the Fourth Proportional to 928.05, 1,391.67 and 278.66

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Solution

The fourth proportional to 928.05, 1,391.67 and 278.66 is: 417.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.05 : 1,391.67 = 278.66 : x
  2. Step 2: Convert to fraction form
    928.05/1,391.67 = 278.66/x
  3. Step 3: Cross multiply
    928.05x = 1,391.67 × 278.66
  4. Step 4: Simplify right side
    928.05x = 387,802.76
  5. Step 5: Solve for x
    x = 387,802.76/928.05
  6. Step 6: Final answer
    x = 417.87

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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.