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Finding the Fourth Proportional to 13,405.65, 20,102.00 and 7,860.80

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Solution

The fourth proportional to 13,405.65, 20,102.00 and 7,860.80 is: 11,787.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,405.65 : 20,102.00 = 7,860.80 : x
  2. Step 2: Convert to fraction form
    13,405.65/20,102.00 = 7,860.80/x
  3. Step 3: Cross multiply
    13,405.65x = 20,102.00 × 7,860.80
  4. Step 4: Simplify right side
    13,405.65x = 158,017,661.79
  5. Step 5: Solve for x
    x = 158,017,661.79/13,405.65
  6. Step 6: Final answer
    x = 11,787.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.