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Finding the Fourth Proportional to 979.96, 1,351.92 and 783.76

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Solution

The fourth proportional to 979.96, 1,351.92 and 783.76 is: 1,081.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.96 : 1,351.92 = 783.76 : x
  2. Step 2: Convert to fraction form
    979.96/1,351.92 = 783.76/x
  3. Step 3: Cross multiply
    979.96x = 1,351.92 × 783.76
  4. Step 4: Simplify right side
    979.96x = 1,059,580.82
  5. Step 5: Solve for x
    x = 1,059,580.82/979.96
  6. Step 6: Final answer
    x = 1,081.25

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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.