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Finding the Fourth Proportional to 1,389.48, 2,085.25 and 659.06

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Solution

The fourth proportional to 1,389.48, 2,085.25 and 659.06 is: 989.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.48 : 2,085.25 = 659.06 : x
  2. Step 2: Convert to fraction form
    1,389.48/2,085.25 = 659.06/x
  3. Step 3: Cross multiply
    1,389.48x = 2,085.25 × 659.06
  4. Step 4: Simplify right side
    1,389.48x = 1,374,304.87
  5. Step 5: Solve for x
    x = 1,374,304.87/1,389.48
  6. Step 6: Final answer
    x = 989.08

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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.