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Finding the Fourth Proportional to 28,339.60, 42,509.40 and 12,787.60

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Solution

The fourth proportional to 28,339.60, 42,509.40 and 12,787.60 is: 19,181.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,339.60 : 42,509.40 = 12,787.60 : x
  2. Step 2: Convert to fraction form
    28,339.60/42,509.40 = 12,787.60/x
  3. Step 3: Cross multiply
    28,339.60x = 42,509.40 × 12,787.60
  4. Step 4: Simplify right side
    28,339.60x = 543,593,203.44
  5. Step 5: Solve for x
    x = 543,593,203.44/28,339.60
  6. Step 6: Final answer
    x = 19,181.40

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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.