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Finding the Fourth Proportional to 971.90, 1,342.26 and 787.22

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Solution

The fourth proportional to 971.90, 1,342.26 and 787.22 is: 1,087.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.90 : 1,342.26 = 787.22 : x
  2. Step 2: Convert to fraction form
    971.90/1,342.26 = 787.22/x
  3. Step 3: Cross multiply
    971.90x = 1,342.26 × 787.22
  4. Step 4: Simplify right side
    971.90x = 1,056,653.92
  5. Step 5: Solve for x
    x = 1,056,653.92/971.90
  6. Step 6: Final answer
    x = 1,087.20

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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.