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Finding the Fourth Proportional to 10,401.64, 14,361.78 and 6,428.20

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Solution

The fourth proportional to 10,401.64, 14,361.78 and 6,428.20 is: 8,875.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,401.64 : 14,361.78 = 6,428.20 : x
  2. Step 2: Convert to fraction form
    10,401.64/14,361.78 = 6,428.20/x
  3. Step 3: Cross multiply
    10,401.64x = 14,361.78 × 6,428.20
  4. Step 4: Simplify right side
    10,401.64x = 92,320,394.20
  5. Step 5: Solve for x
    x = 92,320,394.20/10,401.64
  6. Step 6: Final answer
    x = 8,875.56

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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.