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Finding the Fourth Proportional to 971.48, 1,340.34 and 551.80

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Solution

The fourth proportional to 971.48, 1,340.34 and 551.80 is: 761.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.48 : 1,340.34 = 551.80 : x
  2. Step 2: Convert to fraction form
    971.48/1,340.34 = 551.80/x
  3. Step 3: Cross multiply
    971.48x = 1,340.34 × 551.80
  4. Step 4: Simplify right side
    971.48x = 739,599.61
  5. Step 5: Solve for x
    x = 739,599.61/971.48
  6. Step 6: Final answer
    x = 761.31

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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.