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Finding the Fourth Proportional to 509.18, 702.62 and 312.72

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Solution

The fourth proportional to 509.18, 702.62 and 312.72 is: 431.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.18 : 702.62 = 312.72 : x
  2. Step 2: Convert to fraction form
    509.18/702.62 = 312.72/x
  3. Step 3: Cross multiply
    509.18x = 702.62 × 312.72
  4. Step 4: Simplify right side
    509.18x = 219,723.33
  5. Step 5: Solve for x
    x = 219,723.33/509.18
  6. Step 6: Final answer
    x = 431.52

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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.