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Finding the Fourth Proportional to 390.54, 584.81 and 253.40

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Solution

The fourth proportional to 390.54, 584.81 and 253.40 is: 379.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.54 : 584.81 = 253.40 : x
  2. Step 2: Convert to fraction form
    390.54/584.81 = 253.40/x
  3. Step 3: Cross multiply
    390.54x = 584.81 × 253.40
  4. Step 4: Simplify right side
    390.54x = 148,186.66
  5. Step 5: Solve for x
    x = 148,186.66/390.54
  6. Step 6: Final answer
    x = 379.44

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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.