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Finding the Fourth Proportional to 387.66, 581.13 and 265.98

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Solution

The fourth proportional to 387.66, 581.13 and 265.98 is: 398.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.66 : 581.13 = 265.98 : x
  2. Step 2: Convert to fraction form
    387.66/581.13 = 265.98/x
  3. Step 3: Cross multiply
    387.66x = 581.13 × 265.98
  4. Step 4: Simplify right side
    387.66x = 154,568.96
  5. Step 5: Solve for x
    x = 154,568.96/387.66
  6. Step 6: Final answer
    x = 398.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.