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Finding the Fourth Proportional to 15,681.69, 21,640.70 and 8,607.96

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Solution

The fourth proportional to 15,681.69, 21,640.70 and 8,607.96 is: 11,878.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,681.69 : 21,640.70 = 8,607.96 : x
  2. Step 2: Convert to fraction form
    15,681.69/21,640.70 = 8,607.96/x
  3. Step 3: Cross multiply
    15,681.69x = 21,640.70 × 8,607.96
  4. Step 4: Simplify right side
    15,681.69x = 186,282,279.97
  5. Step 5: Solve for x
    x = 186,282,279.97/15,681.69
  6. Step 6: Final answer
    x = 11,878.97

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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.