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Finding the Fourth Proportional to 3,405, 4,698.90 and 2,165.16

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Solution

The fourth proportional to 3,405, 4,698.90 and 2,165.16 is: 2,987.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405 : 4,698.90 = 2,165.16 : x
  2. Step 2: Convert to fraction form
    3,405/4,698.90 = 2,165.16/x
  3. Step 3: Cross multiply
    3,405x = 4,698.90 × 2,165.16
  4. Step 4: Simplify right side
    3,405x = 10,173,870.32
  5. Step 5: Solve for x
    x = 10,173,870.32/3,405
  6. Step 6: Final answer
    x = 2,987.92

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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.