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Finding the Fourth Proportional to 971.70, 1,337.85 and 905.46

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Solution

The fourth proportional to 971.70, 1,337.85 and 905.46 is: 1,246.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.70 : 1,337.85 = 905.46 : x
  2. Step 2: Convert to fraction form
    971.70/1,337.85 = 905.46/x
  3. Step 3: Cross multiply
    971.70x = 1,337.85 × 905.46
  4. Step 4: Simplify right side
    971.70x = 1,211,369.66
  5. Step 5: Solve for x
    x = 1,211,369.66/971.70
  6. Step 6: Final answer
    x = 1,246.65

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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.