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Finding the Fourth Proportional to 78,411.40, 108,205.86 and 42,600.60

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Solution

The fourth proportional to 78,411.40, 108,205.86 and 42,600.60 is: 58,787.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,411.40 : 108,205.86 = 42,600.60 : x
  2. Step 2: Convert to fraction form
    78,411.40/108,205.86 = 42,600.60/x
  3. Step 3: Cross multiply
    78,411.40x = 108,205.86 × 42,600.60
  4. Step 4: Simplify right side
    78,411.40x = 4,609,634,559.52
  5. Step 5: Solve for x
    x = 4,609,634,559.52/78,411.40
  6. Step 6: Final answer
    x = 58,787.81

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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.