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Finding the Fourth Proportional to 971.18, 1,339.83 and 617.21

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Solution

The fourth proportional to 971.18, 1,339.83 and 617.21 is: 851.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.18 : 1,339.83 = 617.21 : x
  2. Step 2: Convert to fraction form
    971.18/1,339.83 = 617.21/x
  3. Step 3: Cross multiply
    971.18x = 1,339.83 × 617.21
  4. Step 4: Simplify right side
    971.18x = 826,956.47
  5. Step 5: Solve for x
    x = 826,956.47/971.18
  6. Step 6: Final answer
    x = 851.50

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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.