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Finding the Fourth Proportional to 389.12, 537 and 221.08

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Solution

The fourth proportional to 389.12, 537 and 221.08 is: 305.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.12 : 537 = 221.08 : x
  2. Step 2: Convert to fraction form
    389.12/537 = 221.08/x
  3. Step 3: Cross multiply
    389.12x = 537 × 221.08
  4. Step 4: Simplify right side
    389.12x = 118,719.96
  5. Step 5: Solve for x
    x = 118,719.96/389.12
  6. Step 6: Final answer
    x = 305.10

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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.