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Finding the Fourth Proportional to 384.42, 530.49 and 209.76

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Solution

The fourth proportional to 384.42, 530.49 and 209.76 is: 289.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.42 : 530.49 = 209.76 : x
  2. Step 2: Convert to fraction form
    384.42/530.49 = 209.76/x
  3. Step 3: Cross multiply
    384.42x = 530.49 × 209.76
  4. Step 4: Simplify right side
    384.42x = 111,276.37
  5. Step 5: Solve for x
    x = 111,276.37/384.42
  6. Step 6: Final answer
    x = 289.47

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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.