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Finding the Fourth Proportional to 389.45, 537.95 and 291.04

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Solution

The fourth proportional to 389.45, 537.95 and 291.04 is: 402.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.45 : 537.95 = 291.04 : x
  2. Step 2: Convert to fraction form
    389.45/537.95 = 291.04/x
  3. Step 3: Cross multiply
    389.45x = 537.95 × 291.04
  4. Step 4: Simplify right side
    389.45x = 156,562.28
  5. Step 5: Solve for x
    x = 156,562.28/389.45
  6. Step 6: Final answer
    x = 402.01

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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.