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Finding the Fourth Proportional to 389.56, 537.69 and 284.80

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Solution

The fourth proportional to 389.56, 537.69 and 284.80 is: 393.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.56 : 537.69 = 284.80 : x
  2. Step 2: Convert to fraction form
    389.56/537.69 = 284.80/x
  3. Step 3: Cross multiply
    389.56x = 537.69 × 284.80
  4. Step 4: Simplify right side
    389.56x = 153,134.11
  5. Step 5: Solve for x
    x = 153,134.11/389.56
  6. Step 6: Final answer
    x = 393.10

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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.