Home / 5,421.09-8,131.64-1,317.09

Finding the Fourth Proportional to 5,421.09, 8,131.64 and 1,317.09

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Solution

The fourth proportional to 5,421.09, 8,131.64 and 1,317.09 is: 1,975.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,421.09 : 8,131.64 = 1,317.09 : x
  2. Step 2: Convert to fraction form
    5,421.09/8,131.64 = 1,317.09/x
  3. Step 3: Cross multiply
    5,421.09x = 8,131.64 × 1,317.09
  4. Step 4: Simplify right side
    5,421.09x = 10,710,133.04
  5. Step 5: Solve for x
    x = 10,710,133.04/5,421.09
  6. Step 6: Final answer
    x = 1,975.64

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Double scale
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Similar ratio
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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.