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Finding the Fourth Proportional to 971.84, 1,339.80 and 823.88

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Solution

The fourth proportional to 971.84, 1,339.80 and 823.88 is: 1,135.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.84 : 1,339.80 = 823.88 : x
  2. Step 2: Convert to fraction form
    971.84/1,339.80 = 823.88/x
  3. Step 3: Cross multiply
    971.84x = 1,339.80 × 823.88
  4. Step 4: Simplify right side
    971.84x = 1,103,834.42
  5. Step 5: Solve for x
    x = 1,103,834.42/971.84
  6. Step 6: Final answer
    x = 1,135.82

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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.