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Finding the Fourth Proportional to 19,326.21, 28,992.96 and 7,639.53

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Solution

The fourth proportional to 19,326.21, 28,992.96 and 7,639.53 is: 11,460.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,326.21 : 28,992.96 = 7,639.53 : x
  2. Step 2: Convert to fraction form
    19,326.21/28,992.96 = 7,639.53/x
  3. Step 3: Cross multiply
    19,326.21x = 28,992.96 × 7,639.53
  4. Step 4: Simplify right side
    19,326.21x = 221,492,587.71
  5. Step 5: Solve for x
    x = 221,492,587.71/19,326.21
  6. Step 6: Final answer
    x = 11,460.74

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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.