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Finding the Fourth Proportional to 20,709.60, 31,064.40 and 20,515.20

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Solution

The fourth proportional to 20,709.60, 31,064.40 and 20,515.20 is: 30,772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,709.60 : 31,064.40 = 20,515.20 : x
  2. Step 2: Convert to fraction form
    20,709.60/31,064.40 = 20,515.20/x
  3. Step 3: Cross multiply
    20,709.60x = 31,064.40 × 20,515.20
  4. Step 4: Simplify right side
    20,709.60x = 637,292,378.88
  5. Step 5: Solve for x
    x = 637,292,378.88/20,709.60
  6. Step 6: Final answer
    x = 30,772.80

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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.