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Finding the Fourth Proportional to 386,960.72, 580,479.96 and 143,866.76

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Solution

The fourth proportional to 386,960.72, 580,479.96 and 143,866.76 is: 215,814.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,960.72 : 580,479.96 = 143,866.76 : x
  2. Step 2: Convert to fraction form
    386,960.72/580,479.96 = 143,866.76/x
  3. Step 3: Cross multiply
    386,960.72x = 580,479.96 × 143,866.76
  4. Step 4: Simplify right side
    386,960.72x = 83,511,771,090.13
  5. Step 5: Solve for x
    x = 83,511,771,090.13/386,960.72
  6. Step 6: Final answer
    x = 215,814.60

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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.