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Finding the Fourth Proportional to 971.34, 1,339.88 and 690.96

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Solution

The fourth proportional to 971.34, 1,339.88 and 690.96 is: 953.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.34 : 1,339.88 = 690.96 : x
  2. Step 2: Convert to fraction form
    971.34/1,339.88 = 690.96/x
  3. Step 3: Cross multiply
    971.34x = 1,339.88 × 690.96
  4. Step 4: Simplify right side
    971.34x = 925,796.66
  5. Step 5: Solve for x
    x = 925,796.66/971.34
  6. Step 6: Final answer
    x = 953.12

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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.