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Finding the Fourth Proportional to 7,218.77, 9,961.89 and 4,074.98

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Solution

The fourth proportional to 7,218.77, 9,961.89 and 4,074.98 is: 5,623.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,218.77 : 9,961.89 = 4,074.98 : x
  2. Step 2: Convert to fraction form
    7,218.77/9,961.89 = 4,074.98/x
  3. Step 3: Cross multiply
    7,218.77x = 9,961.89 × 4,074.98
  4. Step 4: Simplify right side
    7,218.77x = 40,594,502.51
  5. Step 5: Solve for x
    x = 40,594,502.51/7,218.77
  6. Step 6: Final answer
    x = 5,623.47

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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.