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Finding the Fourth Proportional to 139,241.66, 208,706.96 and 128,032.07

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Solution

The fourth proportional to 139,241.66, 208,706.96 and 128,032.07 is: 191,905.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,241.66 : 208,706.96 = 128,032.07 : x
  2. Step 2: Convert to fraction form
    139,241.66/208,706.96 = 128,032.07/x
  3. Step 3: Cross multiply
    139,241.66x = 208,706.96 × 128,032.07
  4. Step 4: Simplify right side
    139,241.66x = 26,721,183,388.75
  5. Step 5: Solve for x
    x = 26,721,183,388.75/139,241.66
  6. Step 6: Final answer
    x = 191,905.10

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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.