Home / 21,309.20-31,925.40-18,851.60

Finding the Fourth Proportional to 21,309.20, 31,925.40 and 18,851.60

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Solution

The fourth proportional to 21,309.20, 31,925.40 and 18,851.60 is: 28,243.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.20 : 31,925.40 = 18,851.60 : x
  2. Step 2: Convert to fraction form
    21,309.20/31,925.40 = 18,851.60/x
  3. Step 3: Cross multiply
    21,309.20x = 31,925.40 × 18,851.60
  4. Step 4: Simplify right side
    21,309.20x = 601,844,870.64
  5. Step 5: Solve for x
    x = 601,844,870.64/21,309.20
  6. Step 6: Final answer
    x = 28,243.43

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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.