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Finding the Fourth Proportional to 18,956.16, 28,415.21 and 10,639.89

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Solution

The fourth proportional to 18,956.16, 28,415.21 and 10,639.89 is: 15,949.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.16 : 28,415.21 = 10,639.89 : x
  2. Step 2: Convert to fraction form
    18,956.16/28,415.21 = 10,639.89/x
  3. Step 3: Cross multiply
    18,956.16x = 28,415.21 × 10,639.89
  4. Step 4: Simplify right side
    18,956.16x = 302,334,655.53
  5. Step 5: Solve for x
    x = 302,334,655.53/18,956.16
  6. Step 6: Final answer
    x = 15,949.15

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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.