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Finding the Fourth Proportional to 8,756.40, 13,136.40 and 2,917.20

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Solution

The fourth proportional to 8,756.40, 13,136.40 and 2,917.20 is: 4,376.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,756.40 : 13,136.40 = 2,917.20 : x
  2. Step 2: Convert to fraction form
    8,756.40/13,136.40 = 2,917.20/x
  3. Step 3: Cross multiply
    8,756.40x = 13,136.40 × 2,917.20
  4. Step 4: Simplify right side
    8,756.40x = 38,321,506.08
  5. Step 5: Solve for x
    x = 38,321,506.08/8,756.40
  6. Step 6: Final answer
    x = 4,376.40

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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.