Home / 1,389.25-2,083.90-415.35

Finding the Fourth Proportional to 1,389.25, 2,083.90 and 415.35

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Solution

The fourth proportional to 1,389.25, 2,083.90 and 415.35 is: 623.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.25 : 2,083.90 = 415.35 : x
  2. Step 2: Convert to fraction form
    1,389.25/2,083.90 = 415.35/x
  3. Step 3: Cross multiply
    1,389.25x = 2,083.90 × 415.35
  4. Step 4: Simplify right side
    1,389.25x = 865,547.87
  5. Step 5: Solve for x
    x = 865,547.87/1,389.25
  6. Step 6: Final answer
    x = 623.03

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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.