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Finding the Fourth Proportional to 402.59, 603.42 and 287.31

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Solution

The fourth proportional to 402.59, 603.42 and 287.31 is: 430.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.59 : 603.42 = 287.31 : x
  2. Step 2: Convert to fraction form
    402.59/603.42 = 287.31/x
  3. Step 3: Cross multiply
    402.59x = 603.42 × 287.31
  4. Step 4: Simplify right side
    402.59x = 173,368.60
  5. Step 5: Solve for x
    x = 173,368.60/402.59
  6. Step 6: Final answer
    x = 430.64

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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.