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Finding the Fourth Proportional to 509.12, 702.48 and 309.92

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Solution

The fourth proportional to 509.12, 702.48 and 309.92 is: 427.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.12 : 702.48 = 309.92 : x
  2. Step 2: Convert to fraction form
    509.12/702.48 = 309.92/x
  3. Step 3: Cross multiply
    509.12x = 702.48 × 309.92
  4. Step 4: Simplify right side
    509.12x = 217,712.60
  5. Step 5: Solve for x
    x = 217,712.60/509.12
  6. Step 6: Final answer
    x = 427.63

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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.