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Finding the Fourth Proportional to 12,805.62, 17,670.33 and 7,139.88

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Solution

The fourth proportional to 12,805.62, 17,670.33 and 7,139.88 is: 9,852.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,805.62 : 17,670.33 = 7,139.88 : x
  2. Step 2: Convert to fraction form
    12,805.62/17,670.33 = 7,139.88/x
  3. Step 3: Cross multiply
    12,805.62x = 17,670.33 × 7,139.88
  4. Step 4: Simplify right side
    12,805.62x = 126,164,035.76
  5. Step 5: Solve for x
    x = 126,164,035.76/12,805.62
  6. Step 6: Final answer
    x = 9,852.24

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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.