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Finding the Fourth Proportional to 78,813.90, 118,220.85 and 49,289.40

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Solution

The fourth proportional to 78,813.90, 118,220.85 and 49,289.40 is: 73,934.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,813.90 : 118,220.85 = 49,289.40 : x
  2. Step 2: Convert to fraction form
    78,813.90/118,220.85 = 49,289.40/x
  3. Step 3: Cross multiply
    78,813.90x = 118,220.85 × 49,289.40
  4. Step 4: Simplify right side
    78,813.90x = 5,827,034,763.99
  5. Step 5: Solve for x
    x = 5,827,034,763.99/78,813.90
  6. Step 6: Final answer
    x = 73,934.10

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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.