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Finding the Fourth Proportional to 20,566.40, 30,854.40 and 7,420.16

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Solution

The fourth proportional to 20,566.40, 30,854.40 and 7,420.16 is: 11,131.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,566.40 : 30,854.40 = 7,420.16 : x
  2. Step 2: Convert to fraction form
    20,566.40/30,854.40 = 7,420.16/x
  3. Step 3: Cross multiply
    20,566.40x = 30,854.40 × 7,420.16
  4. Step 4: Simplify right side
    20,566.40x = 228,944,584.70
  5. Step 5: Solve for x
    x = 228,944,584.70/20,566.40
  6. Step 6: Final answer
    x = 11,131.97

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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.