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Finding the Fourth Proportional to 1,331.75, 1,998.35 and 647.75

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Solution

The fourth proportional to 1,331.75, 1,998.35 and 647.75 is: 971.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.75 : 1,998.35 = 647.75 : x
  2. Step 2: Convert to fraction form
    1,331.75/1,998.35 = 647.75/x
  3. Step 3: Cross multiply
    1,331.75x = 1,998.35 × 647.75
  4. Step 4: Simplify right side
    1,331.75x = 1,294,431.21
  5. Step 5: Solve for x
    x = 1,294,431.21/1,331.75
  6. Step 6: Final answer
    x = 971.98

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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.