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Finding the Fourth Proportional to 13,809.78, 19,064.71 and 10,778.39

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Solution

The fourth proportional to 13,809.78, 19,064.71 and 10,778.39 is: 14,879.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,809.78 : 19,064.71 = 10,778.39 : x
  2. Step 2: Convert to fraction form
    13,809.78/19,064.71 = 10,778.39/x
  3. Step 3: Cross multiply
    13,809.78x = 19,064.71 × 10,778.39
  4. Step 4: Simplify right side
    13,809.78x = 205,486,730.40
  5. Step 5: Solve for x
    x = 205,486,730.40/13,809.78
  6. Step 6: Final answer
    x = 14,879.80

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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.