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Finding the Fourth Proportional to 979.72, 1,351.38 and 606.28

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Solution

The fourth proportional to 979.72, 1,351.38 and 606.28 is: 836.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.72 : 1,351.38 = 606.28 : x
  2. Step 2: Convert to fraction form
    979.72/1,351.38 = 606.28/x
  3. Step 3: Cross multiply
    979.72x = 1,351.38 × 606.28
  4. Step 4: Simplify right side
    979.72x = 819,314.67
  5. Step 5: Solve for x
    x = 819,314.67/979.72
  6. Step 6: Final answer
    x = 836.27

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Double scale
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1.5x scale

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.