Home / 20,719.64-30,931.75-19,990.64

Finding the Fourth Proportional to 20,719.64, 30,931.75 and 19,990.64

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Solution

The fourth proportional to 20,719.64, 30,931.75 and 19,990.64 is: 29,843.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.64 : 30,931.75 = 19,990.64 : x
  2. Step 2: Convert to fraction form
    20,719.64/30,931.75 = 19,990.64/x
  3. Step 3: Cross multiply
    20,719.64x = 30,931.75 × 19,990.64
  4. Step 4: Simplify right side
    20,719.64x = 618,345,478.82
  5. Step 5: Solve for x
    x = 618,345,478.82/20,719.64
  6. Step 6: Final answer
    x = 29,843.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.