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Finding the Fourth Proportional to 9,781.78, 14,673.90 and 3,208.63

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Solution

The fourth proportional to 9,781.78, 14,673.90 and 3,208.63 is: 4,813.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,781.78 : 14,673.90 = 3,208.63 : x
  2. Step 2: Convert to fraction form
    9,781.78/14,673.90 = 3,208.63/x
  3. Step 3: Cross multiply
    9,781.78x = 14,673.90 × 3,208.63
  4. Step 4: Simplify right side
    9,781.78x = 47,083,115.76
  5. Step 5: Solve for x
    x = 47,083,115.76/9,781.78
  6. Step 6: Final answer
    x = 4,813.35

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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.