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Finding the Fourth Proportional to 78,893,999.80, 118,340,999.70 and 21,386,178.70

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Solution

The fourth proportional to 78,893,999.80, 118,340,999.70 and 21,386,178.70 is: 32,079,268.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,893,999.80 : 118,340,999.70 = 21,386,178.70 : x
  2. Step 2: Convert to fraction form
    78,893,999.80/118,340,999.70 = 21,386,178.70/x
  3. Step 3: Cross multiply
    78,893,999.80x = 118,340,999.70 × 21,386,178.70
  4. Step 4: Simplify right side
    78,893,999.80x = 2,530,861,767,120,846.50
  5. Step 5: Solve for x
    x = 2,530,861,767,120,846.50/78,893,999.80
  6. Step 6: Final answer
    x = 32,079,268.05

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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.