Home / 21,479.81-29,637.43-20,771.87

Finding the Fourth Proportional to 21,479.81, 29,637.43 and 20,771.87

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Solution

The fourth proportional to 21,479.81, 29,637.43 and 20,771.87 is: 28,660.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,479.81 : 29,637.43 = 20,771.87 : x
  2. Step 2: Convert to fraction form
    21,479.81/29,637.43 = 20,771.87/x
  3. Step 3: Cross multiply
    21,479.81x = 29,637.43 × 20,771.87
  4. Step 4: Simplify right side
    21,479.81x = 615,624,642.98
  5. Step 5: Solve for x
    x = 615,624,642.98/21,479.81
  6. Step 6: Final answer
    x = 28,660.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.