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Finding the Fourth Proportional to 1,161.42, 1,742.13 and 1,125.78

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Solution

The fourth proportional to 1,161.42, 1,742.13 and 1,125.78 is: 1,688.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.42 : 1,742.13 = 1,125.78 : x
  2. Step 2: Convert to fraction form
    1,161.42/1,742.13 = 1,125.78/x
  3. Step 3: Cross multiply
    1,161.42x = 1,742.13 × 1,125.78
  4. Step 4: Simplify right side
    1,161.42x = 1,961,255.11
  5. Step 5: Solve for x
    x = 1,961,255.11/1,161.42
  6. Step 6: Final answer
    x = 1,688.67

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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.