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Finding the Fourth Proportional to 425.13, 636.62 and 389.49

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Solution

The fourth proportional to 425.13, 636.62 and 389.49 is: 583.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.13 : 636.62 = 389.49 : x
  2. Step 2: Convert to fraction form
    425.13/636.62 = 389.49/x
  3. Step 3: Cross multiply
    425.13x = 636.62 × 389.49
  4. Step 4: Simplify right side
    425.13x = 247,955.18
  5. Step 5: Solve for x
    x = 247,955.18/425.13
  6. Step 6: Final answer
    x = 583.25

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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.