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Finding the Fourth Proportional to 8,921.79, 13,382.79 and 4,242.27

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Solution

The fourth proportional to 8,921.79, 13,382.79 and 4,242.27 is: 6,363.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.79 : 13,382.79 = 4,242.27 : x
  2. Step 2: Convert to fraction form
    8,921.79/13,382.79 = 4,242.27/x
  3. Step 3: Cross multiply
    8,921.79x = 13,382.79 × 4,242.27
  4. Step 4: Simplify right side
    8,921.79x = 56,773,408.53
  5. Step 5: Solve for x
    x = 56,773,408.53/8,921.79
  6. Step 6: Final answer
    x = 6,363.45

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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.