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Finding the Fourth Proportional to 309.40, 463.69 and 126.58

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Solution

The fourth proportional to 309.40, 463.69 and 126.58 is: 189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.40 : 463.69 = 126.58 : x
  2. Step 2: Convert to fraction form
    309.40/463.69 = 126.58/x
  3. Step 3: Cross multiply
    309.40x = 463.69 × 126.58
  4. Step 4: Simplify right side
    309.40x = 58,693.25
  5. Step 5: Solve for x
    x = 58,693.25/309.40
  6. Step 6: Final answer
    x = 189.70

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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.