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Finding the Fourth Proportional to 78,918.90, 118,378.35 and 49,394.40

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Solution

The fourth proportional to 78,918.90, 118,378.35 and 49,394.40 is: 74,091.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,918.90 : 118,378.35 = 49,394.40 : x
  2. Step 2: Convert to fraction form
    78,918.90/118,378.35 = 49,394.40/x
  3. Step 3: Cross multiply
    78,918.90x = 118,378.35 × 49,394.40
  4. Step 4: Simplify right side
    78,918.90x = 5,847,227,571.24
  5. Step 5: Solve for x
    x = 5,847,227,571.24/78,918.90
  6. Step 6: Final answer
    x = 74,091.60

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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.