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Finding the Fourth Proportional to 436.62, 655.32 and 390.27

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Solution

The fourth proportional to 436.62, 655.32 and 390.27 is: 585.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.62 : 655.32 = 390.27 : x
  2. Step 2: Convert to fraction form
    436.62/655.32 = 390.27/x
  3. Step 3: Cross multiply
    436.62x = 655.32 × 390.27
  4. Step 4: Simplify right side
    436.62x = 255,751.74
  5. Step 5: Solve for x
    x = 255,751.74/436.62
  6. Step 6: Final answer
    x = 585.75

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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.