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Finding the Fourth Proportional to 436.98, 654.93 and 388.11

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Solution

The fourth proportional to 436.98, 654.93 and 388.11 is: 581.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.98 : 654.93 = 388.11 : x
  2. Step 2: Convert to fraction form
    436.98/654.93 = 388.11/x
  3. Step 3: Cross multiply
    436.98x = 654.93 × 388.11
  4. Step 4: Simplify right side
    436.98x = 254,184.88
  5. Step 5: Solve for x
    x = 254,184.88/436.98
  6. Step 6: Final answer
    x = 581.69

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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.