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Finding the Fourth Proportional to 384.81, 530.47 and 306.15

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Solution

The fourth proportional to 384.81, 530.47 and 306.15 is: 422.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.81 : 530.47 = 306.15 : x
  2. Step 2: Convert to fraction form
    384.81/530.47 = 306.15/x
  3. Step 3: Cross multiply
    384.81x = 530.47 × 306.15
  4. Step 4: Simplify right side
    384.81x = 162,407.12
  5. Step 5: Solve for x
    x = 162,407.12/384.81
  6. Step 6: Final answer
    x = 422.05

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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.