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Finding the Fourth Proportional to 509.29, 702.82 and 312.76

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Solution

The fourth proportional to 509.29, 702.82 and 312.76 is: 431.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.29 : 702.82 = 312.76 : x
  2. Step 2: Convert to fraction form
    509.29/702.82 = 312.76/x
  3. Step 3: Cross multiply
    509.29x = 702.82 × 312.76
  4. Step 4: Simplify right side
    509.29x = 219,813.98
  5. Step 5: Solve for x
    x = 219,813.98/509.29
  6. Step 6: Final answer
    x = 431.61

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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.