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Finding the Fourth Proportional to 993.40, 1,370.86 and 551.31

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Solution

The fourth proportional to 993.40, 1,370.86 and 551.31 is: 760.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.40 : 1,370.86 = 551.31 : x
  2. Step 2: Convert to fraction form
    993.40/1,370.86 = 551.31/x
  3. Step 3: Cross multiply
    993.40x = 1,370.86 × 551.31
  4. Step 4: Simplify right side
    993.40x = 755,762.31
  5. Step 5: Solve for x
    x = 755,762.31/993.40
  6. Step 6: Final answer
    x = 760.79

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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.