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Finding the Fourth Proportional to 508.72, 764.06 and 485.91

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Solution

The fourth proportional to 508.72, 764.06 and 485.91 is: 729.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.72 : 764.06 = 485.91 : x
  2. Step 2: Convert to fraction form
    508.72/764.06 = 485.91/x
  3. Step 3: Cross multiply
    508.72x = 764.06 × 485.91
  4. Step 4: Simplify right side
    508.72x = 371,264.39
  5. Step 5: Solve for x
    x = 371,264.39/508.72
  6. Step 6: Final answer
    x = 729.80

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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.