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Finding the Fourth Proportional to 971.19, 1,339.94 and 551.51

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Solution

The fourth proportional to 971.19, 1,339.94 and 551.51 is: 760.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.19 : 1,339.94 = 551.51 : x
  2. Step 2: Convert to fraction form
    971.19/1,339.94 = 551.51/x
  3. Step 3: Cross multiply
    971.19x = 1,339.94 × 551.51
  4. Step 4: Simplify right side
    971.19x = 738,990.31
  5. Step 5: Solve for x
    x = 738,990.31/971.19
  6. Step 6: Final answer
    x = 760.91

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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.