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Finding the Fourth Proportional to 10,698.80, 16,015.80 and 8,085.20

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Solution

The fourth proportional to 10,698.80, 16,015.80 and 8,085.20 is: 12,103.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,698.80 : 16,015.80 = 8,085.20 : x
  2. Step 2: Convert to fraction form
    10,698.80/16,015.80 = 8,085.20/x
  3. Step 3: Cross multiply
    10,698.80x = 16,015.80 × 8,085.20
  4. Step 4: Simplify right side
    10,698.80x = 129,490,946.16
  5. Step 5: Solve for x
    x = 129,490,946.16/10,698.80
  6. Step 6: Final answer
    x = 12,103.31

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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.