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Finding the Fourth Proportional to 153.02, 209.92 and 143.70

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Solution

The fourth proportional to 153.02, 209.92 and 143.70 is: 197.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.02 : 209.92 = 143.70 : x
  2. Step 2: Convert to fraction form
    153.02/209.92 = 143.70/x
  3. Step 3: Cross multiply
    153.02x = 209.92 × 143.70
  4. Step 4: Simplify right side
    153.02x = 30,165.50
  5. Step 5: Solve for x
    x = 30,165.50/153.02
  6. Step 6: Final answer
    x = 197.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.