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Finding the Fourth Proportional to 19,089.78, 28,636.64 and 6,609.78

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Solution

The fourth proportional to 19,089.78, 28,636.64 and 6,609.78 is: 9,915.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,089.78 : 28,636.64 = 6,609.78 : x
  2. Step 2: Convert to fraction form
    19,089.78/28,636.64 = 6,609.78/x
  3. Step 3: Cross multiply
    19,089.78x = 28,636.64 × 6,609.78
  4. Step 4: Simplify right side
    19,089.78x = 189,281,857.29
  5. Step 5: Solve for x
    x = 189,281,857.29/19,089.78
  6. Step 6: Final answer
    x = 9,915.35

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1.5x scale

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.