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Finding the Fourth Proportional to 12,808.50, 17,678.97 and 7,222.74

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Solution

The fourth proportional to 12,808.50, 17,678.97 and 7,222.74 is: 9,969.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,808.50 : 17,678.97 = 7,222.74 : x
  2. Step 2: Convert to fraction form
    12,808.50/17,678.97 = 7,222.74/x
  3. Step 3: Cross multiply
    12,808.50x = 17,678.97 × 7,222.74
  4. Step 4: Simplify right side
    12,808.50x = 127,690,603.78
  5. Step 5: Solve for x
    x = 127,690,603.78/12,808.50
  6. Step 6: Final answer
    x = 9,969.21

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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.