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Finding the Fourth Proportional to 1,278.24, 1,913.76 and 929.28

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Solution

The fourth proportional to 1,278.24, 1,913.76 and 929.28 is: 1,391.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.24 : 1,913.76 = 929.28 : x
  2. Step 2: Convert to fraction form
    1,278.24/1,913.76 = 929.28/x
  3. Step 3: Cross multiply
    1,278.24x = 1,913.76 × 929.28
  4. Step 4: Simplify right side
    1,278.24x = 1,778,418.89
  5. Step 5: Solve for x
    x = 1,778,418.89/1,278.24
  6. Step 6: Final answer
    x = 1,391.30

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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.