Home / 1,246.39-1,869.80-380.50

Finding the Fourth Proportional to 1,246.39, 1,869.80 and 380.50

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Solution

The fourth proportional to 1,246.39, 1,869.80 and 380.50 is: 570.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.39 : 1,869.80 = 380.50 : x
  2. Step 2: Convert to fraction form
    1,246.39/1,869.80 = 380.50/x
  3. Step 3: Cross multiply
    1,246.39x = 1,869.80 × 380.50
  4. Step 4: Simplify right side
    1,246.39x = 711,458.90
  5. Step 5: Solve for x
    x = 711,458.90/1,246.39
  6. Step 6: Final answer
    x = 570.82

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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.