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Finding the Fourth Proportional to 2,118.62, 3,176.92 and 783.98

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Solution

The fourth proportional to 2,118.62, 3,176.92 and 783.98 is: 1,175.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.62 : 3,176.92 = 783.98 : x
  2. Step 2: Convert to fraction form
    2,118.62/3,176.92 = 783.98/x
  3. Step 3: Cross multiply
    2,118.62x = 3,176.92 × 783.98
  4. Step 4: Simplify right side
    2,118.62x = 2,490,623.90
  5. Step 5: Solve for x
    x = 2,490,623.90/2,118.62
  6. Step 6: Final answer
    x = 1,175.59

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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.