Home / 10,421.46-15,640.07-8,075.75

Finding the Fourth Proportional to 10,421.46, 15,640.07 and 8,075.75

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Solution

The fourth proportional to 10,421.46, 15,640.07 and 8,075.75 is: 12,119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,421.46 : 15,640.07 = 8,075.75 : x
  2. Step 2: Convert to fraction form
    10,421.46/15,640.07 = 8,075.75/x
  3. Step 3: Cross multiply
    10,421.46x = 15,640.07 × 8,075.75
  4. Step 4: Simplify right side
    10,421.46x = 126,305,176.72
  5. Step 5: Solve for x
    x = 126,305,176.72/10,421.46
  6. Step 6: Final answer
    x = 12,119.72

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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.