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Finding the Fourth Proportional to 478.93, 718.43 and 186.43

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Solution

The fourth proportional to 478.93, 718.43 and 186.43 is: 279.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.93 : 718.43 = 186.43 : x
  2. Step 2: Convert to fraction form
    478.93/718.43 = 186.43/x
  3. Step 3: Cross multiply
    478.93x = 718.43 × 186.43
  4. Step 4: Simplify right side
    478.93x = 133,936.90
  5. Step 5: Solve for x
    x = 133,936.90/478.93
  6. Step 6: Final answer
    x = 279.66

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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.