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Finding the Fourth Proportional to 993.69, 1,489.44 and 647.28

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Solution

The fourth proportional to 993.69, 1,489.44 and 647.28 is: 970.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.69 : 1,489.44 = 647.28 : x
  2. Step 2: Convert to fraction form
    993.69/1,489.44 = 647.28/x
  3. Step 3: Cross multiply
    993.69x = 1,489.44 × 647.28
  4. Step 4: Simplify right side
    993.69x = 964,084.72
  5. Step 5: Solve for x
    x = 964,084.72/993.69
  6. Step 6: Final answer
    x = 970.21

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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.