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Finding the Fourth Proportional to 1,246.32, 1,869.78 and 380.64

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Solution

The fourth proportional to 1,246.32, 1,869.78 and 380.64 is: 571.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.32 : 1,869.78 = 380.64 : x
  2. Step 2: Convert to fraction form
    1,246.32/1,869.78 = 380.64/x
  3. Step 3: Cross multiply
    1,246.32x = 1,869.78 × 380.64
  4. Step 4: Simplify right side
    1,246.32x = 711,713.06
  5. Step 5: Solve for x
    x = 711,713.06/1,246.32
  6. Step 6: Final answer
    x = 571.05

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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.