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Finding the Fourth Proportional to 387.10, 536.45 and 379.80

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Solution

The fourth proportional to 387.10, 536.45 and 379.80 is: 526.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 536.45 = 379.80 : x
  2. Step 2: Convert to fraction form
    387.10/536.45 = 379.80/x
  3. Step 3: Cross multiply
    387.10x = 536.45 × 379.80
  4. Step 4: Simplify right side
    387.10x = 203,743.71
  5. Step 5: Solve for x
    x = 203,743.71/387.10
  6. Step 6: Final answer
    x = 526.33

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.