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Finding the Fourth Proportional to 8,428.61, 12,639.81 and 2,880.44

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Solution

The fourth proportional to 8,428.61, 12,639.81 and 2,880.44 is: 4,319.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.61 : 12,639.81 = 2,880.44 : x
  2. Step 2: Convert to fraction form
    8,428.61/12,639.81 = 2,880.44/x
  3. Step 3: Cross multiply
    8,428.61x = 12,639.81 × 2,880.44
  4. Step 4: Simplify right side
    8,428.61x = 36,408,214.32
  5. Step 5: Solve for x
    x = 36,408,214.32/8,428.61
  6. Step 6: Final answer
    x = 4,319.60

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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.