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Finding the Fourth Proportional to 18,931.20, 28,396.80 and 6,444.80

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Solution

The fourth proportional to 18,931.20, 28,396.80 and 6,444.80 is: 9,667.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.20 : 28,396.80 = 6,444.80 : x
  2. Step 2: Convert to fraction form
    18,931.20/28,396.80 = 6,444.80/x
  3. Step 3: Cross multiply
    18,931.20x = 28,396.80 × 6,444.80
  4. Step 4: Simplify right side
    18,931.20x = 183,011,522.43
  5. Step 5: Solve for x
    x = 183,011,522.43/18,931.20
  6. Step 6: Final answer
    x = 9,667.19

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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.