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Finding the Fourth Proportional to 8,756.40, 13,135.80 and 2,912.40

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Solution

The fourth proportional to 8,756.40, 13,135.80 and 2,912.40 is: 4,369.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,756.40 : 13,135.80 = 2,912.40 : x
  2. Step 2: Convert to fraction form
    8,756.40/13,135.80 = 2,912.40/x
  3. Step 3: Cross multiply
    8,756.40x = 13,135.80 × 2,912.40
  4. Step 4: Simplify right side
    8,756.40x = 38,256,703.92
  5. Step 5: Solve for x
    x = 38,256,703.92/8,756.40
  6. Step 6: Final answer
    x = 4,369.00

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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.