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Finding the Fourth Proportional to 387.99, 534.87 and 343.98

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Solution

The fourth proportional to 387.99, 534.87 and 343.98 is: 474.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.99 : 534.87 = 343.98 : x
  2. Step 2: Convert to fraction form
    387.99/534.87 = 343.98/x
  3. Step 3: Cross multiply
    387.99x = 534.87 × 343.98
  4. Step 4: Simplify right side
    387.99x = 183,984.58
  5. Step 5: Solve for x
    x = 183,984.58/387.99
  6. Step 6: Final answer
    x = 474.20

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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.