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Finding the Fourth Proportional to 384.78, 530.99 and 210.12

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Solution

The fourth proportional to 384.78, 530.99 and 210.12 is: 289.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.78 : 530.99 = 210.12 : x
  2. Step 2: Convert to fraction form
    384.78/530.99 = 210.12/x
  3. Step 3: Cross multiply
    384.78x = 530.99 × 210.12
  4. Step 4: Simplify right side
    384.78x = 111,571.36
  5. Step 5: Solve for x
    x = 111,571.36/384.78
  6. Step 6: Final answer
    x = 289.96

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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.