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Finding the Fourth Proportional to 509.46, 702.79 and 312.63

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Solution

The fourth proportional to 509.46, 702.79 and 312.63 is: 431.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.46 : 702.79 = 312.63 : x
  2. Step 2: Convert to fraction form
    509.46/702.79 = 312.63/x
  3. Step 3: Cross multiply
    509.46x = 702.79 × 312.63
  4. Step 4: Simplify right side
    509.46x = 219,712.46
  5. Step 5: Solve for x
    x = 219,712.46/509.46
  6. Step 6: Final answer
    x = 431.27

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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.