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Finding the Fourth Proportional to 210.18, 289.80 and 136.42

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Solution

The fourth proportional to 210.18, 289.80 and 136.42 is: 188.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.18 : 289.80 = 136.42 : x
  2. Step 2: Convert to fraction form
    210.18/289.80 = 136.42/x
  3. Step 3: Cross multiply
    210.18x = 289.80 × 136.42
  4. Step 4: Simplify right side
    210.18x = 39,534.52
  5. Step 5: Solve for x
    x = 39,534.52/210.18
  6. Step 6: Final answer
    x = 188.10

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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.