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Finding the Fourth Proportional to 740.43, 1,105.90 and 578.43

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Solution

The fourth proportional to 740.43, 1,105.90 and 578.43 is: 863.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.43 : 1,105.90 = 578.43 : x
  2. Step 2: Convert to fraction form
    740.43/1,105.90 = 578.43/x
  3. Step 3: Cross multiply
    740.43x = 1,105.90 × 578.43
  4. Step 4: Simplify right side
    740.43x = 639,684.29
  5. Step 5: Solve for x
    x = 639,684.29/740.43
  6. Step 6: Final answer
    x = 863.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.