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Finding the Fourth Proportional to 11,455.75, 15,808.90 and 6,979.50

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Solution

The fourth proportional to 11,455.75, 15,808.90 and 6,979.50 is: 9,631.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,455.75 : 15,808.90 = 6,979.50 : x
  2. Step 2: Convert to fraction form
    11,455.75/15,808.90 = 6,979.50/x
  3. Step 3: Cross multiply
    11,455.75x = 15,808.90 × 6,979.50
  4. Step 4: Simplify right side
    11,455.75x = 110,338,138.51
  5. Step 5: Solve for x
    x = 110,338,138.51/11,455.75
  6. Step 6: Final answer
    x = 9,631.69

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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.