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Finding the Fourth Proportional to 929.76, 1,288.52 and 912.48

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Solution

The fourth proportional to 929.76, 1,288.52 and 912.48 is: 1,264.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.76 : 1,288.52 = 912.48 : x
  2. Step 2: Convert to fraction form
    929.76/1,288.52 = 912.48/x
  3. Step 3: Cross multiply
    929.76x = 1,288.52 × 912.48
  4. Step 4: Simplify right side
    929.76x = 1,175,748.73
  5. Step 5: Solve for x
    x = 1,175,748.73/929.76
  6. Step 6: Final answer
    x = 1,264.57

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.