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Finding the Fourth Proportional to 12,781, 19,172.58 and 3,547

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Solution

The fourth proportional to 12,781, 19,172.58 and 3,547 is: 5,320.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,781 : 19,172.58 = 3,547 : x
  2. Step 2: Convert to fraction form
    12,781/19,172.58 = 3,547/x
  3. Step 3: Cross multiply
    12,781x = 19,172.58 × 3,547
  4. Step 4: Simplify right side
    12,781x = 68,005,141.26
  5. Step 5: Solve for x
    x = 68,005,141.26/12,781
  6. Step 6: Final answer
    x = 5,320.80

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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.