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Finding the Fourth Proportional to 436.15, 654.50 and 391.33

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Solution

The fourth proportional to 436.15, 654.50 and 391.33 is: 587.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.15 : 654.50 = 391.33 : x
  2. Step 2: Convert to fraction form
    436.15/654.50 = 391.33/x
  3. Step 3: Cross multiply
    436.15x = 654.50 × 391.33
  4. Step 4: Simplify right side
    436.15x = 256,125.08
  5. Step 5: Solve for x
    x = 256,125.08/436.15
  6. Step 6: Final answer
    x = 587.24

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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.