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Finding the Fourth Proportional to 509.01, 702.19 and 312.63

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Solution

The fourth proportional to 509.01, 702.19 and 312.63 is: 431.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.01 : 702.19 = 312.63 : x
  2. Step 2: Convert to fraction form
    509.01/702.19 = 312.63/x
  3. Step 3: Cross multiply
    509.01x = 702.19 × 312.63
  4. Step 4: Simplify right side
    509.01x = 219,530.22
  5. Step 5: Solve for x
    x = 219,530.22/509.01
  6. Step 6: Final answer
    x = 431.29

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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.