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Finding the Fourth Proportional to 28,054.55, 38,715.28 and 15,479.30

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Solution

The fourth proportional to 28,054.55, 38,715.28 and 15,479.30 is: 21,361.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,054.55 : 38,715.28 = 15,479.30 : x
  2. Step 2: Convert to fraction form
    28,054.55/38,715.28 = 15,479.30/x
  3. Step 3: Cross multiply
    28,054.55x = 38,715.28 × 15,479.30
  4. Step 4: Simplify right side
    28,054.55x = 599,285,491.79
  5. Step 5: Solve for x
    x = 599,285,491.79/28,054.55
  6. Step 6: Final answer
    x = 21,361.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.