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Finding the Fourth Proportional to 385.14, 530.86 and 306.32

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Solution

The fourth proportional to 385.14, 530.86 and 306.32 is: 422.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.14 : 530.86 = 306.32 : x
  2. Step 2: Convert to fraction form
    385.14/530.86 = 306.32/x
  3. Step 3: Cross multiply
    385.14x = 530.86 × 306.32
  4. Step 4: Simplify right side
    385.14x = 162,611.50
  5. Step 5: Solve for x
    x = 162,611.50/385.14
  6. Step 6: Final answer
    x = 422.21

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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.