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Finding the Fourth Proportional to 979.72, 1,476.44 and 918.20

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Solution

The fourth proportional to 979.72, 1,476.44 and 918.20 is: 1,383.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.72 : 1,476.44 = 918.20 : x
  2. Step 2: Convert to fraction form
    979.72/1,476.44 = 918.20/x
  3. Step 3: Cross multiply
    979.72x = 1,476.44 × 918.20
  4. Step 4: Simplify right side
    979.72x = 1,355,667.21
  5. Step 5: Solve for x
    x = 1,355,667.21/979.72
  6. Step 6: Final answer
    x = 1,383.73

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.