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Finding the Fourth Proportional to 28,139,807.80, 42,209,711.70 and 21,762,515.80

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Solution

The fourth proportional to 28,139,807.80, 42,209,711.70 and 21,762,515.80 is: 32,643,773.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,139,807.80 : 42,209,711.70 = 21,762,515.80 : x
  2. Step 2: Convert to fraction form
    28,139,807.80/42,209,711.70 = 21,762,515.80/x
  3. Step 3: Cross multiply
    28,139,807.80x = 42,209,711.70 × 21,762,515.80
  4. Step 4: Simplify right side
    28,139,807.80x = 918,589,517,784,695
  5. Step 5: Solve for x
    x = 918,589,517,784,695/28,139,807.80
  6. Step 6: Final answer
    x = 32,643,773.70

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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.