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Finding the Fourth Proportional to 78,429.94, 108,230.44 and 42,619.18

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Solution

The fourth proportional to 78,429.94, 108,230.44 and 42,619.18 is: 58,812.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,429.94 : 108,230.44 = 42,619.18 : x
  2. Step 2: Convert to fraction form
    78,429.94/108,230.44 = 42,619.18/x
  3. Step 3: Cross multiply
    78,429.94x = 108,230.44 × 42,619.18
  4. Step 4: Simplify right side
    78,429.94x = 4,612,692,603.84
  5. Step 5: Solve for x
    x = 4,612,692,603.84/78,429.94
  6. Step 6: Final answer
    x = 58,812.90

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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.