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Finding the Fourth Proportional to 70,645.90, 105,968.90 and 18,055.44

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Solution

The fourth proportional to 70,645.90, 105,968.90 and 18,055.44 is: 27,083.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,645.90 : 105,968.90 = 18,055.44 : x
  2. Step 2: Convert to fraction form
    70,645.90/105,968.90 = 18,055.44/x
  3. Step 3: Cross multiply
    70,645.90x = 105,968.90 × 18,055.44
  4. Step 4: Simplify right side
    70,645.90x = 1,913,315,115.82
  5. Step 5: Solve for x
    x = 1,913,315,115.82/70,645.90
  6. Step 6: Final answer
    x = 27,083.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.