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Finding the Fourth Proportional to 28,638.40, 42,960.80 and 8,916.80

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Solution

The fourth proportional to 28,638.40, 42,960.80 and 8,916.80 is: 13,376.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.40 : 42,960.80 = 8,916.80 : x
  2. Step 2: Convert to fraction form
    28,638.40/42,960.80 = 8,916.80/x
  3. Step 3: Cross multiply
    28,638.40x = 42,960.80 × 8,916.80
  4. Step 4: Simplify right side
    28,638.40x = 383,072,861.44
  5. Step 5: Solve for x
    x = 383,072,861.44/28,638.40
  6. Step 6: Final answer
    x = 13,376.20

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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.