Home / 13,421.55-18,515.66-8,639.78

Finding the Fourth Proportional to 13,421.55, 18,515.66 and 8,639.78

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Solution

The fourth proportional to 13,421.55, 18,515.66 and 8,639.78 is: 11,918.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.55 : 18,515.66 = 8,639.78 : x
  2. Step 2: Convert to fraction form
    13,421.55/18,515.66 = 8,639.78/x
  3. Step 3: Cross multiply
    13,421.55x = 18,515.66 × 8,639.78
  4. Step 4: Simplify right side
    13,421.55x = 159,971,192.11
  5. Step 5: Solve for x
    x = 159,971,192.11/13,421.55
  6. Step 6: Final answer
    x = 11,918.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.