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Finding the Fourth Proportional to 13,686.57, 18,887.99 and 7,717.88

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Solution

The fourth proportional to 13,686.57, 18,887.99 and 7,717.88 is: 10,650.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,686.57 : 18,887.99 = 7,717.88 : x
  2. Step 2: Convert to fraction form
    13,686.57/18,887.99 = 7,717.88/x
  3. Step 3: Cross multiply
    13,686.57x = 18,887.99 × 7,717.88
  4. Step 4: Simplify right side
    13,686.57x = 145,775,248.89
  5. Step 5: Solve for x
    x = 145,775,248.89/13,686.57
  6. Step 6: Final answer
    x = 10,650.97

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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.