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Finding the Fourth Proportional to 1,541.30, 2,126.76 and 878.12

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Solution

The fourth proportional to 1,541.30, 2,126.76 and 878.12 is: 1,211.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.30 : 2,126.76 = 878.12 : x
  2. Step 2: Convert to fraction form
    1,541.30/2,126.76 = 878.12/x
  3. Step 3: Cross multiply
    1,541.30x = 2,126.76 × 878.12
  4. Step 4: Simplify right side
    1,541.30x = 1,867,550.49
  5. Step 5: Solve for x
    x = 1,867,550.49/1,541.30
  6. Step 6: Final answer
    x = 1,211.67

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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.