Home / 13,613.40-20,420.70-7,690.20

Finding the Fourth Proportional to 13,613.40, 20,420.70 and 7,690.20

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Solution

The fourth proportional to 13,613.40, 20,420.70 and 7,690.20 is: 11,535.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.40 : 20,420.70 = 7,690.20 : x
  2. Step 2: Convert to fraction form
    13,613.40/20,420.70 = 7,690.20/x
  3. Step 3: Cross multiply
    13,613.40x = 20,420.70 × 7,690.20
  4. Step 4: Simplify right side
    13,613.40x = 157,039,267.14
  5. Step 5: Solve for x
    x = 157,039,267.14/13,613.40
  6. Step 6: Final answer
    x = 11,535.64

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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.