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Finding the Fourth Proportional to 85,839,807.70, 128,759,711.55 and 82,491,729.40

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Solution

The fourth proportional to 85,839,807.70, 128,759,711.55 and 82,491,729.40 is: 123,737,594.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839,807.70 : 128,759,711.55 = 82,491,729.40 : x
  2. Step 2: Convert to fraction form
    85,839,807.70/128,759,711.55 = 82,491,729.40/x
  3. Step 3: Cross multiply
    85,839,807.70x = 128,759,711.55 × 82,491,729.40
  4. Step 4: Simplify right side
    85,839,807.70x = 10,621,611,282,804,656
  5. Step 5: Solve for x
    x = 10,621,611,282,804,656/85,839,807.70
  6. Step 6: Final answer
    x = 123,737,594.10

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1.5x scale

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.