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Finding the Fourth Proportional to 384.85, 531.22 and 286.74

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Solution

The fourth proportional to 384.85, 531.22 and 286.74 is: 395.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.85 : 531.22 = 286.74 : x
  2. Step 2: Convert to fraction form
    384.85/531.22 = 286.74/x
  3. Step 3: Cross multiply
    384.85x = 531.22 × 286.74
  4. Step 4: Simplify right side
    384.85x = 152,322.02
  5. Step 5: Solve for x
    x = 152,322.02/384.85
  6. Step 6: Final answer
    x = 395.80

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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.