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Finding the Fourth Proportional to 20,528.58, 30,765 and 11,639.71

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Solution

The fourth proportional to 20,528.58, 30,765 and 11,639.71 is: 17,443.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,528.58 : 30,765 = 11,639.71 : x
  2. Step 2: Convert to fraction form
    20,528.58/30,765 = 11,639.71/x
  3. Step 3: Cross multiply
    20,528.58x = 30,765 × 11,639.71
  4. Step 4: Simplify right side
    20,528.58x = 358,095,678.15
  5. Step 5: Solve for x
    x = 358,095,678.15/20,528.58
  6. Step 6: Final answer
    x = 17,443.76

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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.