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Finding the Fourth Proportional to 28,658.40, 42,987.60 and 8,936.80

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Solution

The fourth proportional to 28,658.40, 42,987.60 and 8,936.80 is: 13,405.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,658.40 : 42,987.60 = 8,936.80 : x
  2. Step 2: Convert to fraction form
    28,658.40/42,987.60 = 8,936.80/x
  3. Step 3: Cross multiply
    28,658.40x = 42,987.60 × 8,936.80
  4. Step 4: Simplify right side
    28,658.40x = 384,171,583.68
  5. Step 5: Solve for x
    x = 384,171,583.68/28,658.40
  6. Step 6: Final answer
    x = 13,405.20

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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.