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Finding the Fourth Proportional to 389.22, 537.18 and 356.28

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Solution

The fourth proportional to 389.22, 537.18 and 356.28 is: 491.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.22 : 537.18 = 356.28 : x
  2. Step 2: Convert to fraction form
    389.22/537.18 = 356.28/x
  3. Step 3: Cross multiply
    389.22x = 537.18 × 356.28
  4. Step 4: Simplify right side
    389.22x = 191,386.49
  5. Step 5: Solve for x
    x = 191,386.49/389.22
  6. Step 6: Final answer
    x = 491.72

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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.