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Finding the Fourth Proportional to 189.90, 285.10 and 117.90

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Solution

The fourth proportional to 189.90, 285.10 and 117.90 is: 177.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.90 : 285.10 = 117.90 : x
  2. Step 2: Convert to fraction form
    189.90/285.10 = 117.90/x
  3. Step 3: Cross multiply
    189.90x = 285.10 × 117.90
  4. Step 4: Simplify right side
    189.90x = 33,613.29
  5. Step 5: Solve for x
    x = 33,613.29/189.90
  6. Step 6: Final answer
    x = 177.01

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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.