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Finding the Fourth Proportional to 436.80, 603.58 and 318.56

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Solution

The fourth proportional to 436.80, 603.58 and 318.56 is: 440.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.80 : 603.58 = 318.56 : x
  2. Step 2: Convert to fraction form
    436.80/603.58 = 318.56/x
  3. Step 3: Cross multiply
    436.80x = 603.58 × 318.56
  4. Step 4: Simplify right side
    436.80x = 192,276.58
  5. Step 5: Solve for x
    x = 192,276.58/436.80
  6. Step 6: Final answer
    x = 440.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.