Home / 1,389.07-2,083.65-415.18

Finding the Fourth Proportional to 1,389.07, 2,083.65 and 415.18

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Solution

The fourth proportional to 1,389.07, 2,083.65 and 415.18 is: 622.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.07 : 2,083.65 = 415.18 : x
  2. Step 2: Convert to fraction form
    1,389.07/2,083.65 = 415.18/x
  3. Step 3: Cross multiply
    1,389.07x = 2,083.65 × 415.18
  4. Step 4: Simplify right side
    1,389.07x = 865,089.81
  5. Step 5: Solve for x
    x = 865,089.81/1,389.07
  6. Step 6: Final answer
    x = 622.78

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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.