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Finding the Fourth Proportional to 78,710.60, 108,619.38 and 42,900.91

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Solution

The fourth proportional to 78,710.60, 108,619.38 and 42,900.91 is: 59,202.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,710.60 : 108,619.38 = 42,900.91 : x
  2. Step 2: Convert to fraction form
    78,710.60/108,619.38 = 42,900.91/x
  3. Step 3: Cross multiply
    78,710.60x = 108,619.38 × 42,900.91
  4. Step 4: Simplify right side
    78,710.60x = 4,659,869,974.09
  5. Step 5: Solve for x
    x = 4,659,869,974.09/78,710.60
  6. Step 6: Final answer
    x = 59,202.57

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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.