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Finding the Fourth Proportional to 398.77, 598.20 and 124.78

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Solution

The fourth proportional to 398.77, 598.20 and 124.78 is: 187.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.77 : 598.20 = 124.78 : x
  2. Step 2: Convert to fraction form
    398.77/598.20 = 124.78/x
  3. Step 3: Cross multiply
    398.77x = 598.20 × 124.78
  4. Step 4: Simplify right side
    398.77x = 74,643.40
  5. Step 5: Solve for x
    x = 74,643.40/398.77
  6. Step 6: Final answer
    x = 187.18

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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.