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Finding the Fourth Proportional to 138,490.73, 191,117.29 and 74,828.51

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Solution

The fourth proportional to 138,490.73, 191,117.29 and 74,828.51 is: 103,263.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,490.73 : 191,117.29 = 74,828.51 : x
  2. Step 2: Convert to fraction form
    138,490.73/191,117.29 = 74,828.51/x
  3. Step 3: Cross multiply
    138,490.73x = 191,117.29 × 74,828.51
  4. Step 4: Simplify right side
    138,490.73x = 14,301,022,045.94
  5. Step 5: Solve for x
    x = 14,301,022,045.94/138,490.73
  6. Step 6: Final answer
    x = 103,263.39

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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.