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Finding the Fourth Proportional to 1,034.40, 1,426.08 and 685.12

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Solution

The fourth proportional to 1,034.40, 1,426.08 and 685.12 is: 944.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.40 : 1,426.08 = 685.12 : x
  2. Step 2: Convert to fraction form
    1,034.40/1,426.08 = 685.12/x
  3. Step 3: Cross multiply
    1,034.40x = 1,426.08 × 685.12
  4. Step 4: Simplify right side
    1,034.40x = 977,035.93
  5. Step 5: Solve for x
    x = 977,035.93/1,034.40
  6. Step 6: Final answer
    x = 944.54

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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.