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Finding the Fourth Proportional to 384.96, 530.69 and 306.31

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Solution

The fourth proportional to 384.96, 530.69 and 306.31 is: 422.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.96 : 530.69 = 306.31 : x
  2. Step 2: Convert to fraction form
    384.96/530.69 = 306.31/x
  3. Step 3: Cross multiply
    384.96x = 530.69 × 306.31
  4. Step 4: Simplify right side
    384.96x = 162,555.65
  5. Step 5: Solve for x
    x = 162,555.65/384.96
  6. Step 6: Final answer
    x = 422.27

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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.