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Finding the Fourth Proportional to 435.88, 650.45 and 387.40

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Solution

The fourth proportional to 435.88, 650.45 and 387.40 is: 578.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.88 : 650.45 = 387.40 : x
  2. Step 2: Convert to fraction form
    435.88/650.45 = 387.40/x
  3. Step 3: Cross multiply
    435.88x = 650.45 × 387.40
  4. Step 4: Simplify right side
    435.88x = 251,984.33
  5. Step 5: Solve for x
    x = 251,984.33/435.88
  6. Step 6: Final answer
    x = 578.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.