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Finding the Fourth Proportional to 15,756.66, 21,743.37 and 8,681.76

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Solution

The fourth proportional to 15,756.66, 21,743.37 and 8,681.76 is: 11,980.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,756.66 : 21,743.37 = 8,681.76 : x
  2. Step 2: Convert to fraction form
    15,756.66/21,743.37 = 8,681.76/x
  3. Step 3: Cross multiply
    15,756.66x = 21,743.37 × 8,681.76
  4. Step 4: Simplify right side
    15,756.66x = 188,770,719.93
  5. Step 5: Solve for x
    x = 188,770,719.93/15,756.66
  6. Step 6: Final answer
    x = 11,980.38

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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.