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Finding the Fourth Proportional to 13,790.68, 20,678.20 and 12,615.16

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Solution

The fourth proportional to 13,790.68, 20,678.20 and 12,615.16 is: 18,915.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,790.68 : 20,678.20 = 12,615.16 : x
  2. Step 2: Convert to fraction form
    13,790.68/20,678.20 = 12,615.16/x
  3. Step 3: Cross multiply
    13,790.68x = 20,678.20 × 12,615.16
  4. Step 4: Simplify right side
    13,790.68x = 260,858,801.51
  5. Step 5: Solve for x
    x = 260,858,801.51/13,790.68
  6. Step 6: Final answer
    x = 18,915.59

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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.