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Finding the Fourth Proportional to 12,911.68, 17,821.93 and 7,608.20

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Solution

The fourth proportional to 12,911.68, 17,821.93 and 7,608.20 is: 10,501.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.68 : 17,821.93 = 7,608.20 : x
  2. Step 2: Convert to fraction form
    12,911.68/17,821.93 = 7,608.20/x
  3. Step 3: Cross multiply
    12,911.68x = 17,821.93 × 7,608.20
  4. Step 4: Simplify right side
    12,911.68x = 135,592,807.83
  5. Step 5: Solve for x
    x = 135,592,807.83/12,911.68
  6. Step 6: Final answer
    x = 10,501.57

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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.