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Finding the Fourth Proportional to 85,967,772.80, 128,951,659.20 and 28,468,918.40

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Solution

The fourth proportional to 85,967,772.80, 128,951,659.20 and 28,468,918.40 is: 42,703,377.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,967,772.80 : 128,951,659.20 = 28,468,918.40 : x
  2. Step 2: Convert to fraction form
    85,967,772.80/128,951,659.20 = 28,468,918.40/x
  3. Step 3: Cross multiply
    85,967,772.80x = 128,951,659.20 × 28,468,918.40
  4. Step 4: Simplify right side
    85,967,772.80x = 3,671,114,263,309,409
  5. Step 5: Solve for x
    x = 3,671,114,263,309,409/85,967,772.80
  6. Step 6: Final answer
    x = 42,703,377.60

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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.