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Finding the Fourth Proportional to 971.19, 1,340.19 and 551.56

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Solution

The fourth proportional to 971.19, 1,340.19 and 551.56 is: 761.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.19 : 1,340.19 = 551.56 : x
  2. Step 2: Convert to fraction form
    971.19/1,340.19 = 551.56/x
  3. Step 3: Cross multiply
    971.19x = 1,340.19 × 551.56
  4. Step 4: Simplify right side
    971.19x = 739,195.20
  5. Step 5: Solve for x
    x = 739,195.20/971.19
  6. Step 6: Final answer
    x = 761.12

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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.