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Finding the Fourth Proportional to 9,718.80, 14,579.64 and 3,142.80

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Solution

The fourth proportional to 9,718.80, 14,579.64 and 3,142.80 is: 4,714.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,718.80 : 14,579.64 = 3,142.80 : x
  2. Step 2: Convert to fraction form
    9,718.80/14,579.64 = 3,142.80/x
  3. Step 3: Cross multiply
    9,718.80x = 14,579.64 × 3,142.80
  4. Step 4: Simplify right side
    9,718.80x = 45,820,892.59
  5. Step 5: Solve for x
    x = 45,820,892.59/9,718.80
  6. Step 6: Final answer
    x = 4,714.67

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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.