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Finding the Fourth Proportional to 13,615.40, 20,412.30 and 7,459.40

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Solution

The fourth proportional to 13,615.40, 20,412.30 and 7,459.40 is: 11,183.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.40 : 20,412.30 = 7,459.40 : x
  2. Step 2: Convert to fraction form
    13,615.40/20,412.30 = 7,459.40/x
  3. Step 3: Cross multiply
    13,615.40x = 20,412.30 × 7,459.40
  4. Step 4: Simplify right side
    13,615.40x = 152,263,510.62
  5. Step 5: Solve for x
    x = 152,263,510.62/13,615.40
  6. Step 6: Final answer
    x = 11,183.18

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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.