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Finding the Fourth Proportional to 8,771.84, 12,107.58 and 5,415.20

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Solution

The fourth proportional to 8,771.84, 12,107.58 and 5,415.20 is: 7,474.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,771.84 : 12,107.58 = 5,415.20 : x
  2. Step 2: Convert to fraction form
    8,771.84/12,107.58 = 5,415.20/x
  3. Step 3: Cross multiply
    8,771.84x = 12,107.58 × 5,415.20
  4. Step 4: Simplify right side
    8,771.84x = 65,564,967.22
  5. Step 5: Solve for x
    x = 65,564,967.22/8,771.84
  6. Step 6: Final answer
    x = 7,474.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.