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Finding the Fourth Proportional to 28,000,607.70, 42,000,911.55 and 20,347,857.30

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Solution

The fourth proportional to 28,000,607.70, 42,000,911.55 and 20,347,857.30 is: 30,521,785.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000,607.70 : 42,000,911.55 = 20,347,857.30 : x
  2. Step 2: Convert to fraction form
    28,000,607.70/42,000,911.55 = 20,347,857.30/x
  3. Step 3: Cross multiply
    28,000,607.70x = 42,000,911.55 × 20,347,857.30
  4. Step 4: Simplify right side
    28,000,607.70x = 854,628,554,689,321.75
  5. Step 5: Solve for x
    x = 854,628,554,689,321.75/28,000,607.70
  6. Step 6: Final answer
    x = 30,521,785.95

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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.