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Finding the Fourth Proportional to 20,779,820.80, 31,098,872.40 and 20,779,820.80

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Solution

The fourth proportional to 20,779,820.80, 31,098,872.40 and 20,779,820.80 is: 31,098,872.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779,820.80 : 31,098,872.40 = 20,779,820.80 : x
  2. Step 2: Convert to fraction form
    20,779,820.80/31,098,872.40 = 20,779,820.80/x
  3. Step 3: Cross multiply
    20,779,820.80x = 31,098,872.40 × 20,779,820.80
  4. Step 4: Simplify right side
    20,779,820.80x = 646,228,995,554,065.88
  5. Step 5: Solve for x
    x = 646,228,995,554,065.88/20,779,820.80
  6. Step 6: Final answer
    x = 31,098,872.40

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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.