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Finding the Fourth Proportional to 78,894,490.80, 118,341,736.20 and 51,684,711.60

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Solution

The fourth proportional to 78,894,490.80, 118,341,736.20 and 51,684,711.60 is: 77,527,067.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,894,490.80 : 118,341,736.20 = 51,684,711.60 : x
  2. Step 2: Convert to fraction form
    78,894,490.80/118,341,736.20 = 51,684,711.60/x
  3. Step 3: Cross multiply
    78,894,490.80x = 118,341,736.20 × 51,684,711.60
  4. Step 4: Simplify right side
    78,894,490.80x = 6,116,458,505,740,280
  5. Step 5: Solve for x
    x = 6,116,458,505,740,280/78,894,490.80
  6. Step 6: Final answer
    x = 77,527,067.40

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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.