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Finding the Fourth Proportional to 390.47, 584.91 and 253.62

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Solution

The fourth proportional to 390.47, 584.91 and 253.62 is: 379.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.47 : 584.91 = 253.62 : x
  2. Step 2: Convert to fraction form
    390.47/584.91 = 253.62/x
  3. Step 3: Cross multiply
    390.47x = 584.91 × 253.62
  4. Step 4: Simplify right side
    390.47x = 148,344.87
  5. Step 5: Solve for x
    x = 148,344.87/390.47
  6. Step 6: Final answer
    x = 379.92

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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.