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Finding the Fourth Proportional to 918.43, 1,378.19 and 341.71

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Solution

The fourth proportional to 918.43, 1,378.19 and 341.71 is: 512.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.43 : 1,378.19 = 341.71 : x
  2. Step 2: Convert to fraction form
    918.43/1,378.19 = 341.71/x
  3. Step 3: Cross multiply
    918.43x = 1,378.19 × 341.71
  4. Step 4: Simplify right side
    918.43x = 470,938.71
  5. Step 5: Solve for x
    x = 470,938.71/918.43
  6. Step 6: Final answer
    x = 512.77

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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.