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Finding the Fourth Proportional to 505.71, 697.91 and 284.74

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Solution

The fourth proportional to 505.71, 697.91 and 284.74 is: 392.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.71 : 697.91 = 284.74 : x
  2. Step 2: Convert to fraction form
    505.71/697.91 = 284.74/x
  3. Step 3: Cross multiply
    505.71x = 697.91 × 284.74
  4. Step 4: Simplify right side
    505.71x = 198,719.40
  5. Step 5: Solve for x
    x = 198,719.40/505.71
  6. Step 6: Final answer
    x = 392.95

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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.