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Finding the Fourth Proportional to 399.29, 598.70 and 139.16

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Solution

The fourth proportional to 399.29, 598.70 and 139.16 is: 208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.29 : 598.70 = 139.16 : x
  2. Step 2: Convert to fraction form
    399.29/598.70 = 139.16/x
  3. Step 3: Cross multiply
    399.29x = 598.70 × 139.16
  4. Step 4: Simplify right side
    399.29x = 83,311.40
  5. Step 5: Solve for x
    x = 83,311.40/399.29
  6. Step 6: Final answer
    x = 208.65

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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.