Home / 1,246.40-1,869.98-380.72

Finding the Fourth Proportional to 1,246.40, 1,869.98 and 380.72

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Solution

The fourth proportional to 1,246.40, 1,869.98 and 380.72 is: 571.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.40 : 1,869.98 = 380.72 : x
  2. Step 2: Convert to fraction form
    1,246.40/1,869.98 = 380.72/x
  3. Step 3: Cross multiply
    1,246.40x = 1,869.98 × 380.72
  4. Step 4: Simplify right side
    1,246.40x = 711,938.79
  5. Step 5: Solve for x
    x = 711,938.79/1,246.40
  6. Step 6: Final answer
    x = 571.20

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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.