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Finding the Fourth Proportional to 2,085.70, 3,128.55 and 546.70

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Solution

The fourth proportional to 2,085.70, 3,128.55 and 546.70 is: 820.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.70 : 3,128.55 = 546.70 : x
  2. Step 2: Convert to fraction form
    2,085.70/3,128.55 = 546.70/x
  3. Step 3: Cross multiply
    2,085.70x = 3,128.55 × 546.70
  4. Step 4: Simplify right side
    2,085.70x = 1,710,378.29
  5. Step 5: Solve for x
    x = 1,710,378.29/2,085.70
  6. Step 6: Final answer
    x = 820.05

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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.