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Finding the Fourth Proportional to 486.61, 729.91 and 139.99

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Solution

The fourth proportional to 486.61, 729.91 and 139.99 is: 209.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.61 : 729.91 = 139.99 : x
  2. Step 2: Convert to fraction form
    486.61/729.91 = 139.99/x
  3. Step 3: Cross multiply
    486.61x = 729.91 × 139.99
  4. Step 4: Simplify right side
    486.61x = 102,180.85
  5. Step 5: Solve for x
    x = 102,180.85/486.61
  6. Step 6: Final answer
    x = 209.99

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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.