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Finding the Fourth Proportional to 12,905, 17,809.38 and 7,315.88

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Solution

The fourth proportional to 12,905, 17,809.38 and 7,315.88 is: 10,096.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905 : 17,809.38 = 7,315.88 : x
  2. Step 2: Convert to fraction form
    12,905/17,809.38 = 7,315.88/x
  3. Step 3: Cross multiply
    12,905x = 17,809.38 × 7,315.88
  4. Step 4: Simplify right side
    12,905x = 130,291,286.95
  5. Step 5: Solve for x
    x = 130,291,286.95/12,905
  6. Step 6: Final answer
    x = 10,096.19

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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.