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Finding the Fourth Proportional to 28,438.80, 42,690.60 and 16,758.60

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Solution

The fourth proportional to 28,438.80, 42,690.60 and 16,758.60 is: 25,156.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,438.80 : 42,690.60 = 16,758.60 : x
  2. Step 2: Convert to fraction form
    28,438.80/42,690.60 = 16,758.60/x
  3. Step 3: Cross multiply
    28,438.80x = 42,690.60 × 16,758.60
  4. Step 4: Simplify right side
    28,438.80x = 715,434,689.16
  5. Step 5: Solve for x
    x = 715,434,689.16/28,438.80
  6. Step 6: Final answer
    x = 25,156.99

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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.