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Finding the Fourth Proportional to 384.21, 530.48 and 315.09

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Solution

The fourth proportional to 384.21, 530.48 and 315.09 is: 435.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.21 : 530.48 = 315.09 : x
  2. Step 2: Convert to fraction form
    384.21/530.48 = 315.09/x
  3. Step 3: Cross multiply
    384.21x = 530.48 × 315.09
  4. Step 4: Simplify right side
    384.21x = 167,149.73
  5. Step 5: Solve for x
    x = 167,149.73/384.21
  6. Step 6: Final answer
    x = 435.05

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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.