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Finding the Fourth Proportional to 28,479.71, 42,745.59 and 14,449.40

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Solution

The fourth proportional to 28,479.71, 42,745.59 and 14,449.40 is: 21,687.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.71 : 42,745.59 = 14,449.40 : x
  2. Step 2: Convert to fraction form
    28,479.71/42,745.59 = 14,449.40/x
  3. Step 3: Cross multiply
    28,479.71x = 42,745.59 × 14,449.40
  4. Step 4: Simplify right side
    28,479.71x = 617,648,128.15
  5. Step 5: Solve for x
    x = 617,648,128.15/28,479.71
  6. Step 6: Final answer
    x = 21,687.30

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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.