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Finding the Fourth Proportional to 12,800.78, 17,664.62 and 7,135.24

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Solution

The fourth proportional to 12,800.78, 17,664.62 and 7,135.24 is: 9,846.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,800.78 : 17,664.62 = 7,135.24 : x
  2. Step 2: Convert to fraction form
    12,800.78/17,664.62 = 7,135.24/x
  3. Step 3: Cross multiply
    12,800.78x = 17,664.62 × 7,135.24
  4. Step 4: Simplify right side
    12,800.78x = 126,041,303.21
  5. Step 5: Solve for x
    x = 126,041,303.21/12,800.78
  6. Step 6: Final answer
    x = 9,846.38

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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.