Home / 1,909.60-2,635.20-1,123.70

Finding the Fourth Proportional to 1,909.60, 2,635.20 and 1,123.70

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Solution

The fourth proportional to 1,909.60, 2,635.20 and 1,123.70 is: 1,550.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.60 : 2,635.20 = 1,123.70 : x
  2. Step 2: Convert to fraction form
    1,909.60/2,635.20 = 1,123.70/x
  3. Step 3: Cross multiply
    1,909.60x = 2,635.20 × 1,123.70
  4. Step 4: Simplify right side
    1,909.60x = 2,961,161.06
  5. Step 5: Solve for x
    x = 2,961,161.06/1,909.60
  6. Step 6: Final answer
    x = 1,550.67

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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.