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Finding the Fourth Proportional to 78,480.90, 108,302.37 and 42,671.81

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Solution

The fourth proportional to 78,480.90, 108,302.37 and 42,671.81 is: 58,886.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,480.90 : 108,302.37 = 42,671.81 : x
  2. Step 2: Convert to fraction form
    78,480.90/108,302.37 = 42,671.81/x
  3. Step 3: Cross multiply
    78,480.90x = 108,302.37 × 42,671.81
  4. Step 4: Simplify right side
    78,480.90x = 4,621,458,265.93
  5. Step 5: Solve for x
    x = 4,621,458,265.93/78,480.90
  6. Step 6: Final answer
    x = 58,886.41

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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.