Home / 5,421.40-8,128.80-2,130.55

Finding the Fourth Proportional to 5,421.40, 8,128.80 and 2,130.55

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Solution

The fourth proportional to 5,421.40, 8,128.80 and 2,130.55 is: 3,194.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.40 : 8,128.80 = 2,130.55 : x
  2. Step 2: Convert to fraction form
    5,421.40/8,128.80 = 2,130.55/x
  3. Step 3: Cross multiply
    5,421.40x = 8,128.80 × 2,130.55
  4. Step 4: Simplify right side
    5,421.40x = 17,318,814.84
  5. Step 5: Solve for x
    x = 17,318,814.84/5,421.40
  6. Step 6: Final answer
    x = 3,194.53

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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.