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Finding the Fourth Proportional to 384.31, 530.35 and 209.66

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Solution

The fourth proportional to 384.31, 530.35 and 209.66 is: 289.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.31 : 530.35 = 209.66 : x
  2. Step 2: Convert to fraction form
    384.31/530.35 = 209.66/x
  3. Step 3: Cross multiply
    384.31x = 530.35 × 209.66
  4. Step 4: Simplify right side
    384.31x = 111,190.01
  5. Step 5: Solve for x
    x = 111,190.01/384.31
  6. Step 6: Final answer
    x = 289.33

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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.