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Finding the Fourth Proportional to 971.36, 1,340.88 and 711.26

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Solution

The fourth proportional to 971.36, 1,340.88 and 711.26 is: 981.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.36 : 1,340.88 = 711.26 : x
  2. Step 2: Convert to fraction form
    971.36/1,340.88 = 711.26/x
  3. Step 3: Cross multiply
    971.36x = 1,340.88 × 711.26
  4. Step 4: Simplify right side
    971.36x = 953,714.31
  5. Step 5: Solve for x
    x = 953,714.31/971.36
  6. Step 6: Final answer
    x = 981.83

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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.