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Finding the Fourth Proportional to 279,936,812.40, 419,905,218.60 and 85,878,178.80

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Solution

The fourth proportional to 279,936,812.40, 419,905,218.60 and 85,878,178.80 is: 128,817,268.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,936,812.40 : 419,905,218.60 = 85,878,178.80 : x
  2. Step 2: Convert to fraction form
    279,936,812.40/419,905,218.60 = 85,878,178.80/x
  3. Step 3: Cross multiply
    279,936,812.40x = 419,905,218.60 × 85,878,178.80
  4. Step 4: Simplify right side
    279,936,812.40x = 36,060,695,441,983,888
  5. Step 5: Solve for x
    x = 36,060,695,441,983,888/279,936,812.40
  6. Step 6: Final answer
    x = 128,817,268.20

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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.