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Finding the Fourth Proportional to 1,086.99, 1,630.15 and 393.58

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Solution

The fourth proportional to 1,086.99, 1,630.15 and 393.58 is: 590.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.99 : 1,630.15 = 393.58 : x
  2. Step 2: Convert to fraction form
    1,086.99/1,630.15 = 393.58/x
  3. Step 3: Cross multiply
    1,086.99x = 1,630.15 × 393.58
  4. Step 4: Simplify right side
    1,086.99x = 641,586.29
  5. Step 5: Solve for x
    x = 641,586.29/1,086.99
  6. Step 6: Final answer
    x = 590.24

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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.