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Finding the Fourth Proportional to 12,699.78, 19,038.30 and 4,906.80

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Solution

The fourth proportional to 12,699.78, 19,038.30 and 4,906.80 is: 7,355.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,699.78 : 19,038.30 = 4,906.80 : x
  2. Step 2: Convert to fraction form
    12,699.78/19,038.30 = 4,906.80/x
  3. Step 3: Cross multiply
    12,699.78x = 19,038.30 × 4,906.80
  4. Step 4: Simplify right side
    12,699.78x = 93,417,130.44
  5. Step 5: Solve for x
    x = 93,417,130.44/12,699.78
  6. Step 6: Final answer
    x = 7,355.81

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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.