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Finding the Fourth Proportional to 387.64, 581.64 and 315.22

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Solution

The fourth proportional to 387.64, 581.64 and 315.22 is: 472.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.64 : 581.64 = 315.22 : x
  2. Step 2: Convert to fraction form
    387.64/581.64 = 315.22/x
  3. Step 3: Cross multiply
    387.64x = 581.64 × 315.22
  4. Step 4: Simplify right side
    387.64x = 183,344.56
  5. Step 5: Solve for x
    x = 183,344.56/387.64
  6. Step 6: Final answer
    x = 472.98

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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.