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Finding the Fourth Proportional to 12,722.78, 17,555.18 and 7,683.63

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Solution

The fourth proportional to 12,722.78, 17,555.18 and 7,683.63 is: 10,602.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,722.78 : 17,555.18 = 7,683.63 : x
  2. Step 2: Convert to fraction form
    12,722.78/17,555.18 = 7,683.63/x
  3. Step 3: Cross multiply
    12,722.78x = 17,555.18 × 7,683.63
  4. Step 4: Simplify right side
    12,722.78x = 134,887,507.70
  5. Step 5: Solve for x
    x = 134,887,507.70/12,722.78
  6. Step 6: Final answer
    x = 10,602.05

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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.