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Finding the Fourth Proportional to 139,129.72, 191,971.02 and 88,162.36

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Solution

The fourth proportional to 139,129.72, 191,971.02 and 88,162.36 is: 121,646.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,129.72 : 191,971.02 = 88,162.36 : x
  2. Step 2: Convert to fraction form
    139,129.72/191,971.02 = 88,162.36/x
  3. Step 3: Cross multiply
    139,129.72x = 191,971.02 × 88,162.36
  4. Step 4: Simplify right side
    139,129.72x = 16,924,618,174.81
  5. Step 5: Solve for x
    x = 16,924,618,174.81/139,129.72
  6. Step 6: Final answer
    x = 121,646.32

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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.