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Finding the Fourth Proportional to 433.17, 648.23 and 390.65

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Solution

The fourth proportional to 433.17, 648.23 and 390.65 is: 584.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.17 : 648.23 = 390.65 : x
  2. Step 2: Convert to fraction form
    433.17/648.23 = 390.65/x
  3. Step 3: Cross multiply
    433.17x = 648.23 × 390.65
  4. Step 4: Simplify right side
    433.17x = 253,225.86
  5. Step 5: Solve for x
    x = 253,225.86/433.17
  6. Step 6: Final answer
    x = 584.59

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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.