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Finding the Fourth Proportional to 389.76, 537.60 and 286.08

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Solution

The fourth proportional to 389.76, 537.60 and 286.08 is: 394.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.76 : 537.60 = 286.08 : x
  2. Step 2: Convert to fraction form
    389.76/537.60 = 286.08/x
  3. Step 3: Cross multiply
    389.76x = 537.60 × 286.08
  4. Step 4: Simplify right side
    389.76x = 153,796.61
  5. Step 5: Solve for x
    x = 153,796.61/389.76
  6. Step 6: Final answer
    x = 394.59

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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.