Home / 2,985.32-4,120.20-2,148.80

Finding the Fourth Proportional to 2,985.32, 4,120.20 and 2,148.80

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Solution

The fourth proportional to 2,985.32, 4,120.20 and 2,148.80 is: 2,965.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.32 : 4,120.20 = 2,148.80 : x
  2. Step 2: Convert to fraction form
    2,985.32/4,120.20 = 2,148.80/x
  3. Step 3: Cross multiply
    2,985.32x = 4,120.20 × 2,148.80
  4. Step 4: Simplify right side
    2,985.32x = 8,853,485.76
  5. Step 5: Solve for x
    x = 8,853,485.76/2,985.32
  6. Step 6: Final answer
    x = 2,965.67

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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.