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Finding the Fourth Proportional to 971.43, 1,341.18 and 640.41

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Solution

The fourth proportional to 971.43, 1,341.18 and 640.41 is: 884.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.43 : 1,341.18 = 640.41 : x
  2. Step 2: Convert to fraction form
    971.43/1,341.18 = 640.41/x
  3. Step 3: Cross multiply
    971.43x = 1,341.18 × 640.41
  4. Step 4: Simplify right side
    971.43x = 858,905.08
  5. Step 5: Solve for x
    x = 858,905.08/971.43
  6. Step 6: Final answer
    x = 884.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.