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Finding the Fourth Proportional to 743.58, 1,115.35 and 431.70

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Solution

The fourth proportional to 743.58, 1,115.35 and 431.70 is: 647.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.58 : 1,115.35 = 431.70 : x
  2. Step 2: Convert to fraction form
    743.58/1,115.35 = 431.70/x
  3. Step 3: Cross multiply
    743.58x = 1,115.35 × 431.70
  4. Step 4: Simplify right side
    743.58x = 481,496.60
  5. Step 5: Solve for x
    x = 481,496.60/743.58
  6. Step 6: Final answer
    x = 647.54

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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.