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Finding the Fourth Proportional to 745.59, 1,118.39 and 439.58

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Solution

The fourth proportional to 745.59, 1,118.39 and 439.58 is: 659.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.59 : 1,118.39 = 439.58 : x
  2. Step 2: Convert to fraction form
    745.59/1,118.39 = 439.58/x
  3. Step 3: Cross multiply
    745.59x = 1,118.39 × 439.58
  4. Step 4: Simplify right side
    745.59x = 491,614.09
  5. Step 5: Solve for x
    x = 491,614.09/745.59
  6. Step 6: Final answer
    x = 659.36

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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.