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Finding the Fourth Proportional to 289.96, 434.78 and 127.45

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Solution

The fourth proportional to 289.96, 434.78 and 127.45 is: 191.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.96 : 434.78 = 127.45 : x
  2. Step 2: Convert to fraction form
    289.96/434.78 = 127.45/x
  3. Step 3: Cross multiply
    289.96x = 434.78 × 127.45
  4. Step 4: Simplify right side
    289.96x = 55,412.71
  5. Step 5: Solve for x
    x = 55,412.71/289.96
  6. Step 6: Final answer
    x = 191.10

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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.