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Finding the Fourth Proportional to 6,479.40, 9,720 and 2,318.22

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Solution

The fourth proportional to 6,479.40, 9,720 and 2,318.22 is: 3,477.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,479.40 : 9,720 = 2,318.22 : x
  2. Step 2: Convert to fraction form
    6,479.40/9,720 = 2,318.22/x
  3. Step 3: Cross multiply
    6,479.40x = 9,720 × 2,318.22
  4. Step 4: Simplify right side
    6,479.40x = 22,533,098.40
  5. Step 5: Solve for x
    x = 22,533,098.40/6,479.40
  6. Step 6: Final answer
    x = 3,477.65

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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.