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Finding the Fourth Proportional to 2,990.90, 4,125.12 and 2,655.16

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Solution

The fourth proportional to 2,990.90, 4,125.12 and 2,655.16 is: 3,662.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.90 : 4,125.12 = 2,655.16 : x
  2. Step 2: Convert to fraction form
    2,990.90/4,125.12 = 2,655.16/x
  3. Step 3: Cross multiply
    2,990.90x = 4,125.12 × 2,655.16
  4. Step 4: Simplify right side
    2,990.90x = 10,952,853.62
  5. Step 5: Solve for x
    x = 10,952,853.62/2,990.90
  6. Step 6: Final answer
    x = 3,662.06

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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.