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Finding the Fourth Proportional to 859.91, 1,289.76 and 508.72

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Solution

The fourth proportional to 859.91, 1,289.76 and 508.72 is: 763.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.91 : 1,289.76 = 508.72 : x
  2. Step 2: Convert to fraction form
    859.91/1,289.76 = 508.72/x
  3. Step 3: Cross multiply
    859.91x = 1,289.76 × 508.72
  4. Step 4: Simplify right side
    859.91x = 656,126.41
  5. Step 5: Solve for x
    x = 656,126.41/859.91
  6. Step 6: Final answer
    x = 763.02

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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.