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Finding the Fourth Proportional to 743.01, 1,115.18 and 378.04

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Solution

The fourth proportional to 743.01, 1,115.18 and 378.04 is: 567.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.01 : 1,115.18 = 378.04 : x
  2. Step 2: Convert to fraction form
    743.01/1,115.18 = 378.04/x
  3. Step 3: Cross multiply
    743.01x = 1,115.18 × 378.04
  4. Step 4: Simplify right side
    743.01x = 421,582.65
  5. Step 5: Solve for x
    x = 421,582.65/743.01
  6. Step 6: Final answer
    x = 567.40

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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.