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Finding the Fourth Proportional to 140.51, 210.95 and 72.08

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Solution

The fourth proportional to 140.51, 210.95 and 72.08 is: 108.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.51 : 210.95 = 72.08 : x
  2. Step 2: Convert to fraction form
    140.51/210.95 = 72.08/x
  3. Step 3: Cross multiply
    140.51x = 210.95 × 72.08
  4. Step 4: Simplify right side
    140.51x = 15,204.40
  5. Step 5: Solve for x
    x = 15,204.40/140.51
  6. Step 6: Final answer
    x = 108.21

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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.