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Finding the Fourth Proportional to 1,086.62, 1,629.92 and 346.31

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Solution

The fourth proportional to 1,086.62, 1,629.92 and 346.31 is: 519.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.62 : 1,629.92 = 346.31 : x
  2. Step 2: Convert to fraction form
    1,086.62/1,629.92 = 346.31/x
  3. Step 3: Cross multiply
    1,086.62x = 1,629.92 × 346.31
  4. Step 4: Simplify right side
    1,086.62x = 564,447.71
  5. Step 5: Solve for x
    x = 564,447.71/1,086.62
  6. Step 6: Final answer
    x = 519.46

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.