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Finding the Fourth Proportional to 138,645.21, 191,330.52 and 74,983.01

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Solution

The fourth proportional to 138,645.21, 191,330.52 and 74,983.01 is: 103,476.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,645.21 : 191,330.52 = 74,983.01 : x
  2. Step 2: Convert to fraction form
    138,645.21/191,330.52 = 74,983.01/x
  3. Step 3: Cross multiply
    138,645.21x = 191,330.52 × 74,983.01
  4. Step 4: Simplify right side
    138,645.21x = 14,346,537,337.81
  5. Step 5: Solve for x
    x = 14,346,537,337.81/138,645.21
  6. Step 6: Final answer
    x = 103,476.62

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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.