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Finding the Fourth Proportional to 478.69, 718.40 and 186.24

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Solution

The fourth proportional to 478.69, 718.40 and 186.24 is: 279.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.69 : 718.40 = 186.24 : x
  2. Step 2: Convert to fraction form
    478.69/718.40 = 186.24/x
  3. Step 3: Cross multiply
    478.69x = 718.40 × 186.24
  4. Step 4: Simplify right side
    478.69x = 133,794.82
  5. Step 5: Solve for x
    x = 133,794.82/478.69
  6. Step 6: Final answer
    x = 279.50

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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.