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Finding the Fourth Proportional to 2,207.90, 3,311.34 and 647.52

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Solution

The fourth proportional to 2,207.90, 3,311.34 and 647.52 is: 971.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,207.90 : 3,311.34 = 647.52 : x
  2. Step 2: Convert to fraction form
    2,207.90/3,311.34 = 647.52/x
  3. Step 3: Cross multiply
    2,207.90x = 3,311.34 × 647.52
  4. Step 4: Simplify right side
    2,207.90x = 2,144,158.88
  5. Step 5: Solve for x
    x = 2,144,158.88/2,207.90
  6. Step 6: Final answer
    x = 971.13

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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.