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Finding the Fourth Proportional to 56,919.80, 85,379.70 and 21,860.30

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Solution

The fourth proportional to 56,919.80, 85,379.70 and 21,860.30 is: 32,790.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,919.80 : 85,379.70 = 21,860.30 : x
  2. Step 2: Convert to fraction form
    56,919.80/85,379.70 = 21,860.30/x
  3. Step 3: Cross multiply
    56,919.80x = 85,379.70 × 21,860.30
  4. Step 4: Simplify right side
    56,919.80x = 1,866,425,855.91
  5. Step 5: Solve for x
    x = 1,866,425,855.91/56,919.80
  6. Step 6: Final answer
    x = 32,790.45

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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.