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Finding the Fourth Proportional to 486.30, 729.45 and 291.90

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Solution

The fourth proportional to 486.30, 729.45 and 291.90 is: 437.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.30 : 729.45 = 291.90 : x
  2. Step 2: Convert to fraction form
    486.30/729.45 = 291.90/x
  3. Step 3: Cross multiply
    486.30x = 729.45 × 291.90
  4. Step 4: Simplify right side
    486.30x = 212,926.46
  5. Step 5: Solve for x
    x = 212,926.46/486.30
  6. Step 6: Final answer
    x = 437.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.