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Finding the Fourth Proportional to 397.95, 547.80 and 357.89

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Solution

The fourth proportional to 397.95, 547.80 and 357.89 is: 492.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.95 : 547.80 = 357.89 : x
  2. Step 2: Convert to fraction form
    397.95/547.80 = 357.89/x
  3. Step 3: Cross multiply
    397.95x = 547.80 × 357.89
  4. Step 4: Simplify right side
    397.95x = 196,048.06
  5. Step 5: Solve for x
    x = 196,048.06/397.95
  6. Step 6: Final answer
    x = 492.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.