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Finding the Fourth Proportional to 993.45, 1,370.90 and 551.32

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Solution

The fourth proportional to 993.45, 1,370.90 and 551.32 is: 760.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.45 : 1,370.90 = 551.32 : x
  2. Step 2: Convert to fraction form
    993.45/1,370.90 = 551.32/x
  3. Step 3: Cross multiply
    993.45x = 1,370.90 × 551.32
  4. Step 4: Simplify right side
    993.45x = 755,804.59
  5. Step 5: Solve for x
    x = 755,804.59/993.45
  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.