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Finding the Fourth Proportional to 435.78, 601.70 and 288.72

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Solution

The fourth proportional to 435.78, 601.70 and 288.72 is: 398.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.78 : 601.70 = 288.72 : x
  2. Step 2: Convert to fraction form
    435.78/601.70 = 288.72/x
  3. Step 3: Cross multiply
    435.78x = 601.70 × 288.72
  4. Step 4: Simplify right side
    435.78x = 173,721.38
  5. Step 5: Solve for x
    x = 173,721.38/435.78
  6. Step 6: Final answer
    x = 398.64

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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.