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Finding the Fourth Proportional to 486.20, 728.93 and 242.55

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Solution

The fourth proportional to 486.20, 728.93 and 242.55 is: 363.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.20 : 728.93 = 242.55 : x
  2. Step 2: Convert to fraction form
    486.20/728.93 = 242.55/x
  3. Step 3: Cross multiply
    486.20x = 728.93 × 242.55
  4. Step 4: Simplify right side
    486.20x = 176,802.58
  5. Step 5: Solve for x
    x = 176,802.58/486.20
  6. Step 6: Final answer
    x = 363.64

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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.