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Finding the Fourth Proportional to 12,912.65, 17,818.02 and 7,878.23

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Solution

The fourth proportional to 12,912.65, 17,818.02 and 7,878.23 is: 10,871.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.65 : 17,818.02 = 7,878.23 : x
  2. Step 2: Convert to fraction form
    12,912.65/17,818.02 = 7,878.23/x
  3. Step 3: Cross multiply
    12,912.65x = 17,818.02 × 7,878.23
  4. Step 4: Simplify right side
    12,912.65x = 140,374,370.61
  5. Step 5: Solve for x
    x = 140,374,370.61/12,912.65
  6. Step 6: Final answer
    x = 10,871.08

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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.