Home / 78,857.40-118,286.10-39,420.60

Finding the Fourth Proportional to 78,857.40, 118,286.10 and 39,420.60

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Solution

The fourth proportional to 78,857.40, 118,286.10 and 39,420.60 is: 59,130.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,857.40 : 118,286.10 = 39,420.60 : x
  2. Step 2: Convert to fraction form
    78,857.40/118,286.10 = 39,420.60/x
  3. Step 3: Cross multiply
    78,857.40x = 118,286.10 × 39,420.60
  4. Step 4: Simplify right side
    78,857.40x = 4,662,909,033.66
  5. Step 5: Solve for x
    x = 4,662,909,033.66/78,857.40
  6. Step 6: Final answer
    x = 59,130.90

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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.