Home / 1,353.81-1,868.87-911.96

Finding the Fourth Proportional to 1,353.81, 1,868.87 and 911.96

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Solution

The fourth proportional to 1,353.81, 1,868.87 and 911.96 is: 1,258.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.81 : 1,868.87 = 911.96 : x
  2. Step 2: Convert to fraction form
    1,353.81/1,868.87 = 911.96/x
  3. Step 3: Cross multiply
    1,353.81x = 1,868.87 × 911.96
  4. Step 4: Simplify right side
    1,353.81x = 1,704,334.63
  5. Step 5: Solve for x
    x = 1,704,334.63/1,353.81
  6. Step 6: Final answer
    x = 1,258.91

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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.