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Finding the Fourth Proportional to 1,389.86, 2,085.36 and 609.46

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Solution

The fourth proportional to 1,389.86, 2,085.36 and 609.46 is: 914.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.86 : 2,085.36 = 609.46 : x
  2. Step 2: Convert to fraction form
    1,389.86/2,085.36 = 609.46/x
  3. Step 3: Cross multiply
    1,389.86x = 2,085.36 × 609.46
  4. Step 4: Simplify right side
    1,389.86x = 1,270,943.51
  5. Step 5: Solve for x
    x = 1,270,943.51/1,389.86
  6. Step 6: Final answer
    x = 914.44

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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.