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Finding the Fourth Proportional to 436.56, 602.40 and 289.12

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Solution

The fourth proportional to 436.56, 602.40 and 289.12 is: 398.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.56 : 602.40 = 289.12 : x
  2. Step 2: Convert to fraction form
    436.56/602.40 = 289.12/x
  3. Step 3: Cross multiply
    436.56x = 602.40 × 289.12
  4. Step 4: Simplify right side
    436.56x = 174,165.89
  5. Step 5: Solve for x
    x = 174,165.89/436.56
  6. Step 6: Final answer
    x = 398.95

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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.