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Finding the Fourth Proportional to 289, 398.76 and 190.72

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Solution

The fourth proportional to 289, 398.76 and 190.72 is: 263.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    289 : 398.76 = 190.72 : x
  2. Step 2: Convert to fraction form
    289/398.76 = 190.72/x
  3. Step 3: Cross multiply
    289x = 398.76 × 190.72
  4. Step 4: Simplify right side
    289x = 76,051.51
  5. Step 5: Solve for x
    x = 76,051.51/289
  6. Step 6: Final answer
    x = 263.15

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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.