Home / 5,421.28-8,131.88-1,317.28

Finding the Fourth Proportional to 5,421.28, 8,131.88 and 1,317.28

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Solution

The fourth proportional to 5,421.28, 8,131.88 and 1,317.28 is: 1,975.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.28 : 8,131.88 = 1,317.28 : x
  2. Step 2: Convert to fraction form
    5,421.28/8,131.88 = 1,317.28/x
  3. Step 3: Cross multiply
    5,421.28x = 8,131.88 × 1,317.28
  4. Step 4: Simplify right side
    5,421.28x = 10,711,962.89
  5. Step 5: Solve for x
    x = 10,711,962.89/5,421.28
  6. Step 6: Final answer
    x = 1,975.91

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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.