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Finding the Fourth Proportional to 138,650.82, 191,338.18 and 74,988.62

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Solution

The fourth proportional to 138,650.82, 191,338.18 and 74,988.62 is: 103,484.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,650.82 : 191,338.18 = 74,988.62 : x
  2. Step 2: Convert to fraction form
    138,650.82/191,338.18 = 74,988.62/x
  3. Step 3: Cross multiply
    138,650.82x = 191,338.18 × 74,988.62
  4. Step 4: Simplify right side
    138,650.82x = 14,348,186,071.51
  5. Step 5: Solve for x
    x = 14,348,186,071.51/138,650.82
  6. Step 6: Final answer
    x = 103,484.32

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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.