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Finding the Fourth Proportional to 199.80, 275.40 and 153

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Solution

The fourth proportional to 199.80, 275.40 and 153 is: 210.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.80 : 275.40 = 153 : x
  2. Step 2: Convert to fraction form
    199.80/275.40 = 153/x
  3. Step 3: Cross multiply
    199.80x = 275.40 × 153
  4. Step 4: Simplify right side
    199.80x = 42,136.20
  5. Step 5: Solve for x
    x = 42,136.20/199.80
  6. Step 6: Final answer
    x = 210.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.