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Finding the Fourth Proportional to 141.18, 210.57 and 139.11

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Solution

The fourth proportional to 141.18, 210.57 and 139.11 is: 207.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.18 : 210.57 = 139.11 : x
  2. Step 2: Convert to fraction form
    141.18/210.57 = 139.11/x
  3. Step 3: Cross multiply
    141.18x = 210.57 × 139.11
  4. Step 4: Simplify right side
    141.18x = 29,292.39
  5. Step 5: Solve for x
    x = 29,292.39/141.18
  6. Step 6: Final answer
    x = 207.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.