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Finding the Fourth Proportional to 78,813.40, 118,220.10 and 39,376.60

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Solution

The fourth proportional to 78,813.40, 118,220.10 and 39,376.60 is: 59,064.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,813.40 : 118,220.10 = 39,376.60 : x
  2. Step 2: Convert to fraction form
    78,813.40/118,220.10 = 39,376.60/x
  3. Step 3: Cross multiply
    78,813.40x = 118,220.10 × 39,376.60
  4. Step 4: Simplify right side
    78,813.40x = 4,655,105,589.66
  5. Step 5: Solve for x
    x = 4,655,105,589.66/78,813.40
  6. Step 6: Final answer
    x = 59,064.90

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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.