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Finding the Fourth Proportional to 13,989.71, 21,061.16 and 12,764.99

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Solution

The fourth proportional to 13,989.71, 21,061.16 and 12,764.99 is: 19,217.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.71 : 21,061.16 = 12,764.99 : x
  2. Step 2: Convert to fraction form
    13,989.71/21,061.16 = 12,764.99/x
  3. Step 3: Cross multiply
    13,989.71x = 21,061.16 × 12,764.99
  4. Step 4: Simplify right side
    13,989.71x = 268,845,533.49
  5. Step 5: Solve for x
    x = 268,845,533.49/13,989.71
  6. Step 6: Final answer
    x = 19,217.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.