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Finding the Fourth Proportional to 56,420.72, 84,636.72 and 20,891.55

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Solution

The fourth proportional to 56,420.72, 84,636.72 and 20,891.55 is: 31,339.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,420.72 : 84,636.72 = 20,891.55 : x
  2. Step 2: Convert to fraction form
    56,420.72/84,636.72 = 20,891.55/x
  3. Step 3: Cross multiply
    56,420.72x = 84,636.72 × 20,891.55
  4. Step 4: Simplify right side
    56,420.72x = 1,768,192,267.72
  5. Step 5: Solve for x
    x = 1,768,192,267.72/56,420.72
  6. Step 6: Final answer
    x = 31,339.42

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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.