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Finding the Fourth Proportional to 510.71, 704.86 and 289.72

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Solution

The fourth proportional to 510.71, 704.86 and 289.72 is: 399.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    510.71 : 704.86 = 289.72 : x
  2. Step 2: Convert to fraction form
    510.71/704.86 = 289.72/x
  3. Step 3: Cross multiply
    510.71x = 704.86 × 289.72
  4. Step 4: Simplify right side
    510.71x = 204,209.55
  5. Step 5: Solve for x
    x = 204,209.55/510.71
  6. Step 6: Final answer
    x = 399.85

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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.