Home / 1,214.18-1,821.48-392.71

Finding the Fourth Proportional to 1,214.18, 1,821.48 and 392.71

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Solution

The fourth proportional to 1,214.18, 1,821.48 and 392.71 is: 589.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.18 : 1,821.48 = 392.71 : x
  2. Step 2: Convert to fraction form
    1,214.18/1,821.48 = 392.71/x
  3. Step 3: Cross multiply
    1,214.18x = 1,821.48 × 392.71
  4. Step 4: Simplify right side
    1,214.18x = 715,313.41
  5. Step 5: Solve for x
    x = 715,313.41/1,214.18
  6. Step 6: Final answer
    x = 589.13

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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.