Home / 54,122.40-81,128.88-20,816.64

Finding the Fourth Proportional to 54,122.40, 81,128.88 and 20,816.64

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Solution

The fourth proportional to 54,122.40, 81,128.88 and 20,816.64 is: 31,203.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,122.40 : 81,128.88 = 20,816.64 : x
  2. Step 2: Convert to fraction form
    54,122.40/81,128.88 = 20,816.64/x
  3. Step 3: Cross multiply
    54,122.40x = 81,128.88 × 20,816.64
  4. Step 4: Simplify right side
    54,122.40x = 1,688,830,688.56
  5. Step 5: Solve for x
    x = 1,688,830,688.56/54,122.40
  6. Step 6: Final answer
    x = 31,203.91

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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.