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Finding the Fourth Proportional to 18,953.84, 28,396.71 and 11,158.40

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Solution

The fourth proportional to 18,953.84, 28,396.71 and 11,158.40 is: 16,717.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,953.84 : 28,396.71 = 11,158.40 : x
  2. Step 2: Convert to fraction form
    18,953.84/28,396.71 = 11,158.40/x
  3. Step 3: Cross multiply
    18,953.84x = 28,396.71 × 11,158.40
  4. Step 4: Simplify right side
    18,953.84x = 316,861,848.86
  5. Step 5: Solve for x
    x = 316,861,848.86/18,953.84
  6. Step 6: Final answer
    x = 16,717.55

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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.