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Finding the Fourth Proportional to 399.10, 598.49 and 139.03

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Solution

The fourth proportional to 399.10, 598.49 and 139.03 is: 208.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.10 : 598.49 = 139.03 : x
  2. Step 2: Convert to fraction form
    399.10/598.49 = 139.03/x
  3. Step 3: Cross multiply
    399.10x = 598.49 × 139.03
  4. Step 4: Simplify right side
    399.10x = 83,208.06
  5. Step 5: Solve for x
    x = 83,208.06/399.10
  6. Step 6: Final answer
    x = 208.49

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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.