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Finding the Fourth Proportional to 979.76, 1,467.84 and 912.32

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Solution

The fourth proportional to 979.76, 1,467.84 and 912.32 is: 1,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.76 : 1,467.84 = 912.32 : x
  2. Step 2: Convert to fraction form
    979.76/1,467.84 = 912.32/x
  3. Step 3: Cross multiply
    979.76x = 1,467.84 × 912.32
  4. Step 4: Simplify right side
    979.76x = 1,339,139.79
  5. Step 5: Solve for x
    x = 1,339,139.79/979.76
  6. Step 6: Final answer
    x = 1,366.80

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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.