Home / 740.20-1,108.69-431.75

Finding the Fourth Proportional to 740.20, 1,108.69 and 431.75

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Solution

The fourth proportional to 740.20, 1,108.69 and 431.75 is: 646.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.20 : 1,108.69 = 431.75 : x
  2. Step 2: Convert to fraction form
    740.20/1,108.69 = 431.75/x
  3. Step 3: Cross multiply
    740.20x = 1,108.69 × 431.75
  4. Step 4: Simplify right side
    740.20x = 478,676.91
  5. Step 5: Solve for x
    x = 478,676.91/740.20
  6. Step 6: Final answer
    x = 646.69

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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.