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Finding the Fourth Proportional to 1,645.65, 2,270.95 and 899.61

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Solution

The fourth proportional to 1,645.65, 2,270.95 and 899.61 is: 1,241.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.65 : 2,270.95 = 899.61 : x
  2. Step 2: Convert to fraction form
    1,645.65/2,270.95 = 899.61/x
  3. Step 3: Cross multiply
    1,645.65x = 2,270.95 × 899.61
  4. Step 4: Simplify right side
    1,645.65x = 2,042,969.33
  5. Step 5: Solve for x
    x = 2,042,969.33/1,645.65
  6. Step 6: Final answer
    x = 1,241.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.