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Finding the Fourth Proportional to 509.07, 702.63 and 312.75

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Solution

The fourth proportional to 509.07, 702.63 and 312.75 is: 431.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.07 : 702.63 = 312.75 : x
  2. Step 2: Convert to fraction form
    509.07/702.63 = 312.75/x
  3. Step 3: Cross multiply
    509.07x = 702.63 × 312.75
  4. Step 4: Simplify right side
    509.07x = 219,747.53
  5. Step 5: Solve for x
    x = 219,747.53/509.07
  6. Step 6: Final answer
    x = 431.66

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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.