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Finding the Fourth Proportional to 510.90, 705.08 and 289.92

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Solution

The fourth proportional to 510.90, 705.08 and 289.92 is: 400.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.90 : 705.08 = 289.92 : x
  2. Step 2: Convert to fraction form
    510.90/705.08 = 289.92/x
  3. Step 3: Cross multiply
    510.90x = 705.08 × 289.92
  4. Step 4: Simplify right side
    510.90x = 204,414.87
  5. Step 5: Solve for x
    x = 204,414.87/510.90
  6. Step 6: Final answer
    x = 400.11

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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.