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Finding the Fourth Proportional to 8,707.80, 12,007.80 and 6,816

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Solution

The fourth proportional to 8,707.80, 12,007.80 and 6,816 is: 9,399.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,707.80 : 12,007.80 = 6,816 : x
  2. Step 2: Convert to fraction form
    8,707.80/12,007.80 = 6,816/x
  3. Step 3: Cross multiply
    8,707.80x = 12,007.80 × 6,816
  4. Step 4: Simplify right side
    8,707.80x = 81,845,164.80
  5. Step 5: Solve for x
    x = 81,845,164.80/8,707.80
  6. Step 6: Final answer
    x = 9,399.06

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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.