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Finding the Fourth Proportional to 1,550.36, 2,139.12 and 878.18

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Solution

The fourth proportional to 1,550.36, 2,139.12 and 878.18 is: 1,211.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.36 : 2,139.12 = 878.18 : x
  2. Step 2: Convert to fraction form
    1,550.36/2,139.12 = 878.18/x
  3. Step 3: Cross multiply
    1,550.36x = 2,139.12 × 878.18
  4. Step 4: Simplify right side
    1,550.36x = 1,878,521.71
  5. Step 5: Solve for x
    x = 1,878,521.71/1,550.36
  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.