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Finding the Fourth Proportional to 980.04, 1,353.06 and 686

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Solution

The fourth proportional to 980.04, 1,353.06 and 686 is: 947.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.04 : 1,353.06 = 686 : x
  2. Step 2: Convert to fraction form
    980.04/1,353.06 = 686/x
  3. Step 3: Cross multiply
    980.04x = 1,353.06 × 686
  4. Step 4: Simplify right side
    980.04x = 928,199.16
  5. Step 5: Solve for x
    x = 928,199.16/980.04
  6. Step 6: Final answer
    x = 947.10

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Double scale
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Similar ratio
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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.