Home / 1,415.40-2,120.70-1,170.60

Finding the Fourth Proportional to 1,415.40, 2,120.70 and 1,170.60

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Solution

The fourth proportional to 1,415.40, 2,120.70 and 1,170.60 is: 1,753.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 2,120.70 = 1,170.60 : x
  2. Step 2: Convert to fraction form
    1,415.40/2,120.70 = 1,170.60/x
  3. Step 3: Cross multiply
    1,415.40x = 2,120.70 × 1,170.60
  4. Step 4: Simplify right side
    1,415.40x = 2,482,491.42
  5. Step 5: Solve for x
    x = 2,482,491.42/1,415.40
  6. Step 6: Final answer
    x = 1,753.92

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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.