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Finding the Fourth Proportional to 478.87, 718.31 and 190.51

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Solution

The fourth proportional to 478.87, 718.31 and 190.51 is: 285.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.87 : 718.31 = 190.51 : x
  2. Step 2: Convert to fraction form
    478.87/718.31 = 190.51/x
  3. Step 3: Cross multiply
    478.87x = 718.31 × 190.51
  4. Step 4: Simplify right side
    478.87x = 136,845.24
  5. Step 5: Solve for x
    x = 136,845.24/478.87
  6. Step 6: Final answer
    x = 285.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.