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Finding the Fourth Proportional to 13,559.80, 18,714.50 and 7,816.15

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Solution

The fourth proportional to 13,559.80, 18,714.50 and 7,816.15 is: 10,787.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,559.80 : 18,714.50 = 7,816.15 : x
  2. Step 2: Convert to fraction form
    13,559.80/18,714.50 = 7,816.15/x
  3. Step 3: Cross multiply
    13,559.80x = 18,714.50 × 7,816.15
  4. Step 4: Simplify right side
    13,559.80x = 146,275,339.18
  5. Step 5: Solve for x
    x = 146,275,339.18/13,559.80
  6. Step 6: Final answer
    x = 10,787.43

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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.