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Finding the Fourth Proportional to 28,931.44, 43,396.40 and 9,211.20

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Solution

The fourth proportional to 28,931.44, 43,396.40 and 9,211.20 is: 13,816.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,931.44 : 43,396.40 = 9,211.20 : x
  2. Step 2: Convert to fraction form
    28,931.44/43,396.40 = 9,211.20/x
  3. Step 3: Cross multiply
    28,931.44x = 43,396.40 × 9,211.20
  4. Step 4: Simplify right side
    28,931.44x = 399,732,919.68
  5. Step 5: Solve for x
    x = 399,732,919.68/28,931.44
  6. Step 6: Final answer
    x = 13,816.56

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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.