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Finding the Fourth Proportional to 13,920.63, 20,884.18 and 4,686.63

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Solution

The fourth proportional to 13,920.63, 20,884.18 and 4,686.63 is: 7,031.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.63 : 20,884.18 = 4,686.63 : x
  2. Step 2: Convert to fraction form
    13,920.63/20,884.18 = 4,686.63/x
  3. Step 3: Cross multiply
    13,920.63x = 20,884.18 × 4,686.63
  4. Step 4: Simplify right side
    13,920.63x = 97,876,424.51
  5. Step 5: Solve for x
    x = 97,876,424.51/13,920.63
  6. Step 6: Final answer
    x = 7,031.03

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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.