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Finding the Fourth Proportional to 979.32, 1,353.22 and 771.10

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Solution

The fourth proportional to 979.32, 1,353.22 and 771.10 is: 1,065.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.32 : 1,353.22 = 771.10 : x
  2. Step 2: Convert to fraction form
    979.32/1,353.22 = 771.10/x
  3. Step 3: Cross multiply
    979.32x = 1,353.22 × 771.10
  4. Step 4: Simplify right side
    979.32x = 1,043,462.63
  5. Step 5: Solve for x
    x = 1,043,462.63/979.32
  6. Step 6: Final answer
    x = 1,065.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.