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Finding the Fourth Proportional to 13,686.12, 18,887 and 7,717.64

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Solution

The fourth proportional to 13,686.12, 18,887 and 7,717.64 is: 10,650.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,686.12 : 18,887 = 7,717.64 : x
  2. Step 2: Convert to fraction form
    13,686.12/18,887 = 7,717.64/x
  3. Step 3: Cross multiply
    13,686.12x = 18,887 × 7,717.64
  4. Step 4: Simplify right side
    13,686.12x = 145,763,066.68
  5. Step 5: Solve for x
    x = 145,763,066.68/13,686.12
  6. Step 6: Final answer
    x = 10,650.43

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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.