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Finding the Fourth Proportional to 13,177.80, 19,718.70 and 9,721.80

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Solution

The fourth proportional to 13,177.80, 19,718.70 and 9,721.80 is: 14,547.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,177.80 : 19,718.70 = 9,721.80 : x
  2. Step 2: Convert to fraction form
    13,177.80/19,718.70 = 9,721.80/x
  3. Step 3: Cross multiply
    13,177.80x = 19,718.70 × 9,721.80
  4. Step 4: Simplify right side
    13,177.80x = 191,701,257.66
  5. Step 5: Solve for x
    x = 191,701,257.66/13,177.80
  6. Step 6: Final answer
    x = 14,547.29

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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.