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Finding the Fourth Proportional to 8,415.90, 12,622.40 and 2,792.88

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Solution

The fourth proportional to 8,415.90, 12,622.40 and 2,792.88 is: 4,188.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415.90 : 12,622.40 = 2,792.88 : x
  2. Step 2: Convert to fraction form
    8,415.90/12,622.40 = 2,792.88/x
  3. Step 3: Cross multiply
    8,415.90x = 12,622.40 × 2,792.88
  4. Step 4: Simplify right side
    8,415.90x = 35,252,848.51
  5. Step 5: Solve for x
    x = 35,252,848.51/8,415.90
  6. Step 6: Final answer
    x = 4,188.84

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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.