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Finding the Fourth Proportional to 13,785.98, 20,681.03 and 6,391.19

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Solution

The fourth proportional to 13,785.98, 20,681.03 and 6,391.19 is: 9,587.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,785.98 : 20,681.03 = 6,391.19 : x
  2. Step 2: Convert to fraction form
    13,785.98/20,681.03 = 6,391.19/x
  3. Step 3: Cross multiply
    13,785.98x = 20,681.03 × 6,391.19
  4. Step 4: Simplify right side
    13,785.98x = 132,176,256.76
  5. Step 5: Solve for x
    x = 132,176,256.76/13,785.98
  6. Step 6: Final answer
    x = 9,587.73

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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.