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Finding the Fourth Proportional to 390.03, 584.35 and 347.66

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Solution

The fourth proportional to 390.03, 584.35 and 347.66 is: 520.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.03 : 584.35 = 347.66 : x
  2. Step 2: Convert to fraction form
    390.03/584.35 = 347.66/x
  3. Step 3: Cross multiply
    390.03x = 584.35 × 347.66
  4. Step 4: Simplify right side
    390.03x = 203,155.12
  5. Step 5: Solve for x
    x = 203,155.12/390.03
  6. Step 6: Final answer
    x = 520.87

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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.