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Finding the Fourth Proportional to 12,859.78, 19,256.64 and 8,905.42

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Solution

The fourth proportional to 12,859.78, 19,256.64 and 8,905.42 is: 13,335.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,859.78 : 19,256.64 = 8,905.42 : x
  2. Step 2: Convert to fraction form
    12,859.78/19,256.64 = 8,905.42/x
  3. Step 3: Cross multiply
    12,859.78x = 19,256.64 × 8,905.42
  4. Step 4: Simplify right side
    12,859.78x = 171,488,466.99
  5. Step 5: Solve for x
    x = 171,488,466.99/12,859.78
  6. Step 6: Final answer
    x = 13,335.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.