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Finding the Fourth Proportional to 18,972.30, 28,468.74 and 7,886.64

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Solution

The fourth proportional to 18,972.30, 28,468.74 and 7,886.64 is: 11,834.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,972.30 : 28,468.74 = 7,886.64 : x
  2. Step 2: Convert to fraction form
    18,972.30/28,468.74 = 7,886.64/x
  3. Step 3: Cross multiply
    18,972.30x = 28,468.74 × 7,886.64
  4. Step 4: Simplify right side
    18,972.30x = 224,522,703.63
  5. Step 5: Solve for x
    x = 224,522,703.63/18,972.30
  6. Step 6: Final answer
    x = 11,834.24

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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.