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Finding the Fourth Proportional to 100,690.74, 138,918.62 and 62,436.51

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Solution

The fourth proportional to 100,690.74, 138,918.62 and 62,436.51 is: 86,140.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,690.74 : 138,918.62 = 62,436.51 : x
  2. Step 2: Convert to fraction form
    100,690.74/138,918.62 = 62,436.51/x
  3. Step 3: Cross multiply
    100,690.74x = 138,918.62 × 62,436.51
  4. Step 4: Simplify right side
    100,690.74x = 8,673,593,494.63
  5. Step 5: Solve for x
    x = 8,673,593,494.63/100,690.74
  6. Step 6: Final answer
    x = 86,140.93

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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.