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Finding the Fourth Proportional to 509.31, 702.80 and 288.22

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Solution

The fourth proportional to 509.31, 702.80 and 288.22 is: 397.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.31 : 702.80 = 288.22 : x
  2. Step 2: Convert to fraction form
    509.31/702.80 = 288.22/x
  3. Step 3: Cross multiply
    509.31x = 702.80 × 288.22
  4. Step 4: Simplify right side
    509.31x = 202,562.02
  5. Step 5: Solve for x
    x = 202,562.02/509.31
  6. Step 6: Final answer
    x = 397.72

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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.