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Finding the Fourth Proportional to 993.61, 1,370.42 and 662.47

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Solution

The fourth proportional to 993.61, 1,370.42 and 662.47 is: 913.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.61 : 1,370.42 = 662.47 : x
  2. Step 2: Convert to fraction form
    993.61/1,370.42 = 662.47/x
  3. Step 3: Cross multiply
    993.61x = 1,370.42 × 662.47
  4. Step 4: Simplify right side
    993.61x = 907,860.37
  5. Step 5: Solve for x
    x = 907,860.37/993.61
  6. Step 6: Final answer
    x = 913.70

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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.