Home / 19,777.40-29,666.10-12,390.20

Finding the Fourth Proportional to 19,777.40, 29,666.10 and 12,390.20

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Solution

The fourth proportional to 19,777.40, 29,666.10 and 12,390.20 is: 18,585.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,777.40 : 29,666.10 = 12,390.20 : x
  2. Step 2: Convert to fraction form
    19,777.40/29,666.10 = 12,390.20/x
  3. Step 3: Cross multiply
    19,777.40x = 29,666.10 × 12,390.20
  4. Step 4: Simplify right side
    19,777.40x = 367,568,912.22
  5. Step 5: Solve for x
    x = 367,568,912.22/19,777.40
  6. Step 6: Final answer
    x = 18,585.30

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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.