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Finding the Fourth Proportional to 153,753.36, 212,070.60 and 99,939.12

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Solution

The fourth proportional to 153,753.36, 212,070.60 and 99,939.12 is: 137,845.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,753.36 : 212,070.60 = 99,939.12 : x
  2. Step 2: Convert to fraction form
    153,753.36/212,070.60 = 99,939.12/x
  3. Step 3: Cross multiply
    153,753.36x = 212,070.60 × 99,939.12
  4. Step 4: Simplify right side
    153,753.36x = 21,194,149,141.87
  5. Step 5: Solve for x
    x = 21,194,149,141.87/153,753.36
  6. Step 6: Final answer
    x = 137,845.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.