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Finding the Fourth Proportional to 289.97, 434.99 and 125.40

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Solution

The fourth proportional to 289.97, 434.99 and 125.40 is: 188.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.97 : 434.99 = 125.40 : x
  2. Step 2: Convert to fraction form
    289.97/434.99 = 125.40/x
  3. Step 3: Cross multiply
    289.97x = 434.99 × 125.40
  4. Step 4: Simplify right side
    289.97x = 54,547.12
  5. Step 5: Solve for x
    x = 54,547.12/289.97
  6. Step 6: Final answer
    x = 188.12

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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.