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Finding the Fourth Proportional to 509.80, 703.51 and 285.72

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Solution

The fourth proportional to 509.80, 703.51 and 285.72 is: 394.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.80 : 703.51 = 285.72 : x
  2. Step 2: Convert to fraction form
    509.80/703.51 = 285.72/x
  3. Step 3: Cross multiply
    509.80x = 703.51 × 285.72
  4. Step 4: Simplify right side
    509.80x = 201,006.88
  5. Step 5: Solve for x
    x = 201,006.88/509.80
  6. Step 6: Final answer
    x = 394.29

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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.