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Finding the Fourth Proportional to 478.65, 718.08 and 186.15

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Solution

The fourth proportional to 478.65, 718.08 and 186.15 is: 279.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.65 : 718.08 = 186.15 : x
  2. Step 2: Convert to fraction form
    478.65/718.08 = 186.15/x
  3. Step 3: Cross multiply
    478.65x = 718.08 × 186.15
  4. Step 4: Simplify right side
    478.65x = 133,670.59
  5. Step 5: Solve for x
    x = 133,670.59/478.65
  6. Step 6: Final answer
    x = 279.27

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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.