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Finding the Fourth Proportional to 745.35, 1,118.20 and 398.50

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Solution

The fourth proportional to 745.35, 1,118.20 and 398.50 is: 597.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.35 : 1,118.20 = 398.50 : x
  2. Step 2: Convert to fraction form
    745.35/1,118.20 = 398.50/x
  3. Step 3: Cross multiply
    745.35x = 1,118.20 × 398.50
  4. Step 4: Simplify right side
    745.35x = 445,604.82
  5. Step 5: Solve for x
    x = 445,604.82/745.35
  6. Step 6: Final answer
    x = 597.84

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Half scale
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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.