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Finding the Fourth Proportional to 54,209.60, 81,314.40 and 20,931.20

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Solution

The fourth proportional to 54,209.60, 81,314.40 and 20,931.20 is: 31,396.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,209.60 : 81,314.40 = 20,931.20 : x
  2. Step 2: Convert to fraction form
    54,209.60/81,314.40 = 20,931.20/x
  3. Step 3: Cross multiply
    54,209.60x = 81,314.40 × 20,931.20
  4. Step 4: Simplify right side
    54,209.60x = 1,702,007,969.28
  5. Step 5: Solve for x
    x = 1,702,007,969.28/54,209.60
  6. Step 6: Final answer
    x = 31,396.80

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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.