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Finding the Fourth Proportional to 20,803.60, 31,140.60 and 20,155.60

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Solution

The fourth proportional to 20,803.60, 31,140.60 and 20,155.60 is: 30,170.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.60 : 31,140.60 = 20,155.60 : x
  2. Step 2: Convert to fraction form
    20,803.60/31,140.60 = 20,155.60/x
  3. Step 3: Cross multiply
    20,803.60x = 31,140.60 × 20,155.60
  4. Step 4: Simplify right side
    20,803.60x = 627,657,477.36
  5. Step 5: Solve for x
    x = 627,657,477.36/20,803.60
  6. Step 6: Final answer
    x = 30,170.62

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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.