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Finding the Fourth Proportional to 971.30, 1,340.40 and 551.65

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Solution

The fourth proportional to 971.30, 1,340.40 and 551.65 is: 761.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.30 : 1,340.40 = 551.65 : x
  2. Step 2: Convert to fraction form
    971.30/1,340.40 = 551.65/x
  3. Step 3: Cross multiply
    971.30x = 1,340.40 × 551.65
  4. Step 4: Simplify right side
    971.30x = 739,431.66
  5. Step 5: Solve for x
    x = 739,431.66/971.30
  6. Step 6: Final answer
    x = 761.28

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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.