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Finding the Fourth Proportional to 1,620.99, 2,431.68 and 647.10

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Solution

The fourth proportional to 1,620.99, 2,431.68 and 647.10 is: 970.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.99 : 2,431.68 = 647.10 : x
  2. Step 2: Convert to fraction form
    1,620.99/2,431.68 = 647.10/x
  3. Step 3: Cross multiply
    1,620.99x = 2,431.68 × 647.10
  4. Step 4: Simplify right side
    1,620.99x = 1,573,540.13
  5. Step 5: Solve for x
    x = 1,573,540.13/1,620.99
  6. Step 6: Final answer
    x = 970.73

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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.