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Finding the Fourth Proportional to 290,331,856.80, 435,696,850.80 and 128,889,655.20

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Solution

The fourth proportional to 290,331,856.80, 435,696,850.80 and 128,889,655.20 is: 193,422,855.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,331,856.80 : 435,696,850.80 = 128,889,655.20 : x
  2. Step 2: Convert to fraction form
    290,331,856.80/435,696,850.80 = 128,889,655.20/x
  3. Step 3: Cross multiply
    290,331,856.80x = 435,696,850.80 × 128,889,655.20
  4. Step 4: Simplify right side
    290,331,856.80x = 56,156,816,871,337,848
  5. Step 5: Solve for x
    x = 56,156,816,871,337,848/290,331,856.80
  6. Step 6: Final answer
    x = 193,422,855.80

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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.