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Finding the Fourth Proportional to 13,687.10, 18,887.95 and 7,718.78

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Solution

The fourth proportional to 13,687.10, 18,887.95 and 7,718.78 is: 10,651.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.10 : 18,887.95 = 7,718.78 : x
  2. Step 2: Convert to fraction form
    13,687.10/18,887.95 = 7,718.78/x
  3. Step 3: Cross multiply
    13,687.10x = 18,887.95 × 7,718.78
  4. Step 4: Simplify right side
    13,687.10x = 145,791,816.96
  5. Step 5: Solve for x
    x = 145,791,816.96/13,687.10
  6. Step 6: Final answer
    x = 10,651.77

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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.