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Finding the Fourth Proportional to 316,616.82, 474,949.98 and 91,980.96

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Solution

The fourth proportional to 316,616.82, 474,949.98 and 91,980.96 is: 137,978.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,616.82 : 474,949.98 = 91,980.96 : x
  2. Step 2: Convert to fraction form
    316,616.82/474,949.98 = 91,980.96/x
  3. Step 3: Cross multiply
    316,616.82x = 474,949.98 × 91,980.96
  4. Step 4: Simplify right side
    316,616.82x = 43,686,355,112.38
  5. Step 5: Solve for x
    x = 43,686,355,112.38/316,616.82
  6. Step 6: Final answer
    x = 137,978.63

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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.