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Finding the Fourth Proportional to 390.87, 585.50 and 253.98

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Solution

The fourth proportional to 390.87, 585.50 and 253.98 is: 380.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.87 : 585.50 = 253.98 : x
  2. Step 2: Convert to fraction form
    390.87/585.50 = 253.98/x
  3. Step 3: Cross multiply
    390.87x = 585.50 × 253.98
  4. Step 4: Simplify right side
    390.87x = 148,704.02
  5. Step 5: Solve for x
    x = 148,704.02/390.87
  6. Step 6: Final answer
    x = 380.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.