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Finding the Fourth Proportional to 993.67, 1,489.39 and 647.66

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Solution

The fourth proportional to 993.67, 1,489.39 and 647.66 is: 970.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.67 : 1,489.39 = 647.66 : x
  2. Step 2: Convert to fraction form
    993.67/1,489.39 = 647.66/x
  3. Step 3: Cross multiply
    993.67x = 1,489.39 × 647.66
  4. Step 4: Simplify right side
    993.67x = 964,620.43
  5. Step 5: Solve for x
    x = 964,620.43/993.67
  6. Step 6: Final answer
    x = 970.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.