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Finding the Fourth Proportional to 13,656.87, 18,846.18 and 7,689.20

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Solution

The fourth proportional to 13,656.87, 18,846.18 and 7,689.20 is: 10,610.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,656.87 : 18,846.18 = 7,689.20 : x
  2. Step 2: Convert to fraction form
    13,656.87/18,846.18 = 7,689.20/x
  3. Step 3: Cross multiply
    13,656.87x = 18,846.18 × 7,689.20
  4. Step 4: Simplify right side
    13,656.87x = 144,911,953.03
  5. Step 5: Solve for x
    x = 144,911,953.03/13,656.87
  6. Step 6: Final answer
    x = 10,610.92

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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.