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Finding the Fourth Proportional to 509.40, 702.92 and 288.32

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Solution

The fourth proportional to 509.40, 702.92 and 288.32 is: 397.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.40 : 702.92 = 288.32 : x
  2. Step 2: Convert to fraction form
    509.40/702.92 = 288.32/x
  3. Step 3: Cross multiply
    509.40x = 702.92 × 288.32
  4. Step 4: Simplify right side
    509.40x = 202,665.89
  5. Step 5: Solve for x
    x = 202,665.89/509.40
  6. Step 6: Final answer
    x = 397.85

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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.