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Finding the Fourth Proportional to 971.46, 1,341.60 and 640.14

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Solution

The fourth proportional to 971.46, 1,341.60 and 640.14 is: 884.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.46 : 1,341.60 = 640.14 : x
  2. Step 2: Convert to fraction form
    971.46/1,341.60 = 640.14/x
  3. Step 3: Cross multiply
    971.46x = 1,341.60 × 640.14
  4. Step 4: Simplify right side
    971.46x = 858,811.82
  5. Step 5: Solve for x
    x = 858,811.82/971.46
  6. Step 6: Final answer
    x = 884.04

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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.