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Finding the Fourth Proportional to 78,734.60, 118,101.90 and 39,368.60

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Solution

The fourth proportional to 78,734.60, 118,101.90 and 39,368.60 is: 59,052.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,734.60 : 118,101.90 = 39,368.60 : x
  2. Step 2: Convert to fraction form
    78,734.60/118,101.90 = 39,368.60/x
  3. Step 3: Cross multiply
    78,734.60x = 118,101.90 × 39,368.60
  4. Step 4: Simplify right side
    78,734.60x = 4,649,506,460.34
  5. Step 5: Solve for x
    x = 4,649,506,460.34/78,734.60
  6. Step 6: Final answer
    x = 59,052.90

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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.