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Finding the Fourth Proportional to 8,784.80, 13,172.40 and 2,938.40

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Solution

The fourth proportional to 8,784.80, 13,172.40 and 2,938.40 is: 4,405.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,784.80 : 13,172.40 = 2,938.40 : x
  2. Step 2: Convert to fraction form
    8,784.80/13,172.40 = 2,938.40/x
  3. Step 3: Cross multiply
    8,784.80x = 13,172.40 × 2,938.40
  4. Step 4: Simplify right side
    8,784.80x = 38,705,780.16
  5. Step 5: Solve for x
    x = 38,705,780.16/8,784.80
  6. Step 6: Final answer
    x = 4,405.99

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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.