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Finding the Fourth Proportional to 445,495.16, 668,171.66 and 129,878.28

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Solution

The fourth proportional to 445,495.16, 668,171.66 and 129,878.28 is: 194,796.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,495.16 : 668,171.66 = 129,878.28 : x
  2. Step 2: Convert to fraction form
    445,495.16/668,171.66 = 129,878.28/x
  3. Step 3: Cross multiply
    445,495.16x = 668,171.66 × 129,878.28
  4. Step 4: Simplify right side
    445,495.16x = 86,780,985,945.54
  5. Step 5: Solve for x
    x = 86,780,985,945.54/445,495.16
  6. Step 6: Final answer
    x = 194,796.70

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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.