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Finding the Fourth Proportional to 2,085.68, 3,128.52 and 698.76

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Solution

The fourth proportional to 2,085.68, 3,128.52 and 698.76 is: 1,048.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.68 : 3,128.52 = 698.76 : x
  2. Step 2: Convert to fraction form
    2,085.68/3,128.52 = 698.76/x
  3. Step 3: Cross multiply
    2,085.68x = 3,128.52 × 698.76
  4. Step 4: Simplify right side
    2,085.68x = 2,186,084.64
  5. Step 5: Solve for x
    x = 2,186,084.64/2,085.68
  6. Step 6: Final answer
    x = 1,048.14

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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.