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Finding the Fourth Proportional to 899.01, 1,238.95 and 649.90

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Solution

The fourth proportional to 899.01, 1,238.95 and 649.90 is: 895.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.01 : 1,238.95 = 649.90 : x
  2. Step 2: Convert to fraction form
    899.01/1,238.95 = 649.90/x
  3. Step 3: Cross multiply
    899.01x = 1,238.95 × 649.90
  4. Step 4: Simplify right side
    899.01x = 805,195.97
  5. Step 5: Solve for x
    x = 805,195.97/899.01
  6. Step 6: Final answer
    x = 895.65

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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.