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Finding the Fourth Proportional to 505.68, 697.89 and 284.61

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Solution

The fourth proportional to 505.68, 697.89 and 284.61 is: 392.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.68 : 697.89 = 284.61 : x
  2. Step 2: Convert to fraction form
    505.68/697.89 = 284.61/x
  3. Step 3: Cross multiply
    505.68x = 697.89 × 284.61
  4. Step 4: Simplify right side
    505.68x = 198,626.47
  5. Step 5: Solve for x
    x = 198,626.47/505.68
  6. Step 6: Final answer
    x = 392.79

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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.