Home / 11,421.42-15,760.40-6,385.20

Finding the Fourth Proportional to 11,421.42, 15,760.40 and 6,385.20

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Solution

The fourth proportional to 11,421.42, 15,760.40 and 6,385.20 is: 8,810.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,421.42 : 15,760.40 = 6,385.20 : x
  2. Step 2: Convert to fraction form
    11,421.42/15,760.40 = 6,385.20/x
  3. Step 3: Cross multiply
    11,421.42x = 15,760.40 × 6,385.20
  4. Step 4: Simplify right side
    11,421.42x = 100,633,274.15
  5. Step 5: Solve for x
    x = 100,633,274.15/11,421.42
  6. Step 6: Final answer
    x = 8,810.92

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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.