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Finding the Fourth Proportional to 142,656.67, 196,866.07 and 78,994.47

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Solution

The fourth proportional to 142,656.67, 196,866.07 and 78,994.47 is: 109,012.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,656.67 : 196,866.07 = 78,994.47 : x
  2. Step 2: Convert to fraction form
    142,656.67/196,866.07 = 78,994.47/x
  3. Step 3: Cross multiply
    142,656.67x = 196,866.07 × 78,994.47
  4. Step 4: Simplify right side
    142,656.67x = 15,551,330,860.63
  5. Step 5: Solve for x
    x = 15,551,330,860.63/142,656.67
  6. Step 6: Final answer
    x = 109,012.29

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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.