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Finding the Fourth Proportional to 6,619.68, 9,929.28 and 3,156

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Solution

The fourth proportional to 6,619.68, 9,929.28 and 3,156 is: 4,733.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,619.68 : 9,929.28 = 3,156 : x
  2. Step 2: Convert to fraction form
    6,619.68/9,929.28 = 3,156/x
  3. Step 3: Cross multiply
    6,619.68x = 9,929.28 × 3,156
  4. Step 4: Simplify right side
    6,619.68x = 31,336,807.68
  5. Step 5: Solve for x
    x = 31,336,807.68/6,619.68
  6. Step 6: Final answer
    x = 4,733.89

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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.