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Finding the Fourth Proportional to 979.95, 1,352.34 and 606.81

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Solution

The fourth proportional to 979.95, 1,352.34 and 606.81 is: 837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.95 : 1,352.34 = 606.81 : x
  2. Step 2: Convert to fraction form
    979.95/1,352.34 = 606.81/x
  3. Step 3: Cross multiply
    979.95x = 1,352.34 × 606.81
  4. Step 4: Simplify right side
    979.95x = 820,613.44
  5. Step 5: Solve for x
    x = 820,613.44/979.95
  6. Step 6: Final answer
    x = 837.40

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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.