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Finding the Fourth Proportional to 78,863.40, 118,035.90 and 61,237.80

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Solution

The fourth proportional to 78,863.40, 118,035.90 and 61,237.80 is: 91,655.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,863.40 : 118,035.90 = 61,237.80 : x
  2. Step 2: Convert to fraction form
    78,863.40/118,035.90 = 61,237.80/x
  3. Step 3: Cross multiply
    78,863.40x = 118,035.90 × 61,237.80
  4. Step 4: Simplify right side
    78,863.40x = 7,228,258,837.02
  5. Step 5: Solve for x
    x = 7,228,258,837.02/78,863.40
  6. Step 6: Final answer
    x = 91,655.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.