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Finding the Fourth Proportional to 971.79, 1,337.29 and 861.50

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Solution

The fourth proportional to 971.79, 1,337.29 and 861.50 is: 1,185.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.79 : 1,337.29 = 861.50 : x
  2. Step 2: Convert to fraction form
    971.79/1,337.29 = 861.50/x
  3. Step 3: Cross multiply
    971.79x = 1,337.29 × 861.50
  4. Step 4: Simplify right side
    971.79x = 1,152,066.49
  5. Step 5: Solve for x
    x = 1,152,066.49/971.79
  6. Step 6: Final answer
    x = 1,185.51

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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.