Home / 3,122.64-4,685.58-1,390.86

Finding the Fourth Proportional to 3,122.64, 4,685.58 and 1,390.86

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Solution

The fourth proportional to 3,122.64, 4,685.58 and 1,390.86 is: 2,087.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,122.64 : 4,685.58 = 1,390.86 : x
  2. Step 2: Convert to fraction form
    3,122.64/4,685.58 = 1,390.86/x
  3. Step 3: Cross multiply
    3,122.64x = 4,685.58 × 1,390.86
  4. Step 4: Simplify right side
    3,122.64x = 6,516,985.80
  5. Step 5: Solve for x
    x = 6,516,985.80/3,122.64
  6. Step 6: Final answer
    x = 2,087.01

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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.