Home / 21,261.60-31,816.80-18,518.40

Finding the Fourth Proportional to 21,261.60, 31,816.80 and 18,518.40

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Solution

The fourth proportional to 21,261.60, 31,816.80 and 18,518.40 is: 27,711.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,261.60 : 31,816.80 = 18,518.40 : x
  2. Step 2: Convert to fraction form
    21,261.60/31,816.80 = 18,518.40/x
  3. Step 3: Cross multiply
    21,261.60x = 31,816.80 × 18,518.40
  4. Step 4: Simplify right side
    21,261.60x = 589,196,229.12
  5. Step 5: Solve for x
    x = 589,196,229.12/21,261.60
  6. Step 6: Final answer
    x = 27,711.75

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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.