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Finding the Fourth Proportional to 6,885.76, 10,323.20 and 3,421.12

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Solution

The fourth proportional to 6,885.76, 10,323.20 and 3,421.12 is: 5,128.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,885.76 : 10,323.20 = 3,421.12 : x
  2. Step 2: Convert to fraction form
    6,885.76/10,323.20 = 3,421.12/x
  3. Step 3: Cross multiply
    6,885.76x = 10,323.20 × 3,421.12
  4. Step 4: Simplify right side
    6,885.76x = 35,316,905.98
  5. Step 5: Solve for x
    x = 35,316,905.98/6,885.76
  6. Step 6: Final answer
    x = 5,128.98

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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.