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Finding the Fourth Proportional to 971.45, 1,340.39 and 551.77

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Solution

The fourth proportional to 971.45, 1,340.39 and 551.77 is: 761.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.45 : 1,340.39 = 551.77 : x
  2. Step 2: Convert to fraction form
    971.45/1,340.39 = 551.77/x
  3. Step 3: Cross multiply
    971.45x = 1,340.39 × 551.77
  4. Step 4: Simplify right side
    971.45x = 739,586.99
  5. Step 5: Solve for x
    x = 739,586.99/971.45
  6. Step 6: Final answer
    x = 761.32

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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.