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Finding the Fourth Proportional to 385.19, 530.99 and 306.53

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Solution

The fourth proportional to 385.19, 530.99 and 306.53 is: 422.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.19 : 530.99 = 306.53 : x
  2. Step 2: Convert to fraction form
    385.19/530.99 = 306.53/x
  3. Step 3: Cross multiply
    385.19x = 530.99 × 306.53
  4. Step 4: Simplify right side
    385.19x = 162,764.89
  5. Step 5: Solve for x
    x = 162,764.89/385.19
  6. Step 6: Final answer
    x = 422.56

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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.