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Finding the Fourth Proportional to 7,918.94, 11,878.55 and 2,990.90

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Solution

The fourth proportional to 7,918.94, 11,878.55 and 2,990.90 is: 4,486.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,918.94 : 11,878.55 = 2,990.90 : x
  2. Step 2: Convert to fraction form
    7,918.94/11,878.55 = 2,990.90/x
  3. Step 3: Cross multiply
    7,918.94x = 11,878.55 × 2,990.90
  4. Step 4: Simplify right side
    7,918.94x = 35,527,555.20
  5. Step 5: Solve for x
    x = 35,527,555.20/7,918.94
  6. Step 6: Final answer
    x = 4,486.40

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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.