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Finding the Fourth Proportional to 139,045.36, 191,780.64 and 91,281.28

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Solution

The fourth proportional to 139,045.36, 191,780.64 and 91,281.28 is: 125,901.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,045.36 : 191,780.64 = 91,281.28 : x
  2. Step 2: Convert to fraction form
    139,045.36/191,780.64 = 91,281.28/x
  3. Step 3: Cross multiply
    139,045.36x = 191,780.64 × 91,281.28
  4. Step 4: Simplify right side
    139,045.36x = 17,505,982,298.42
  5. Step 5: Solve for x
    x = 17,505,982,298.42/139,045.36
  6. Step 6: Final answer
    x = 125,901.23

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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.