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Finding the Fourth Proportional to 15,305.50, 21,121.59 and 8,681.50

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Solution

The fourth proportional to 15,305.50, 21,121.59 and 8,681.50 is: 11,980.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,305.50 : 21,121.59 = 8,681.50 : x
  2. Step 2: Convert to fraction form
    15,305.50/21,121.59 = 8,681.50/x
  3. Step 3: Cross multiply
    15,305.50x = 21,121.59 × 8,681.50
  4. Step 4: Simplify right side
    15,305.50x = 183,367,083.59
  5. Step 5: Solve for x
    x = 183,367,083.59/15,305.50
  6. Step 6: Final answer
    x = 11,980.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.