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Finding the Fourth Proportional to 389.76, 538.34 and 291.95

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Solution

The fourth proportional to 389.76, 538.34 and 291.95 is: 403.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.76 : 538.34 = 291.95 : x
  2. Step 2: Convert to fraction form
    389.76/538.34 = 291.95/x
  3. Step 3: Cross multiply
    389.76x = 538.34 × 291.95
  4. Step 4: Simplify right side
    389.76x = 157,164.21
  5. Step 5: Solve for x
    x = 157,164.21/389.76
  6. Step 6: Final answer
    x = 403.23

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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.