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Finding the Fourth Proportional to 138,317.25, 190,875.93 and 77,888.62

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Solution

The fourth proportional to 138,317.25, 190,875.93 and 77,888.62 is: 107,485.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,317.25 : 190,875.93 = 77,888.62 : x
  2. Step 2: Convert to fraction form
    138,317.25/190,875.93 = 77,888.62/x
  3. Step 3: Cross multiply
    138,317.25x = 190,875.93 × 77,888.62
  4. Step 4: Simplify right side
    138,317.25x = 14,867,061,435.09
  5. Step 5: Solve for x
    x = 14,867,061,435.09/138,317.25
  6. Step 6: Final answer
    x = 107,485.23

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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.