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Finding the Fourth Proportional to 387.84, 534.12 and 289.86

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Solution

The fourth proportional to 387.84, 534.12 and 289.86 is: 399.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.84 : 534.12 = 289.86 : x
  2. Step 2: Convert to fraction form
    387.84/534.12 = 289.86/x
  3. Step 3: Cross multiply
    387.84x = 534.12 × 289.86
  4. Step 4: Simplify right side
    387.84x = 154,820.02
  5. Step 5: Solve for x
    x = 154,820.02/387.84
  6. Step 6: Final answer
    x = 399.19

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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.