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Finding the Fourth Proportional to 390.02, 584.42 and 287.15

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Solution

The fourth proportional to 390.02, 584.42 and 287.15 is: 430.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.02 : 584.42 = 287.15 : x
  2. Step 2: Convert to fraction form
    390.02/584.42 = 287.15/x
  3. Step 3: Cross multiply
    390.02x = 584.42 × 287.15
  4. Step 4: Simplify right side
    390.02x = 167,811.85
  5. Step 5: Solve for x
    x = 167,811.85/390.02
  6. Step 6: Final answer
    x = 430.27

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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.