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Finding the Fourth Proportional to 2,085.76, 3,128.64 and 546.76

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Solution

The fourth proportional to 2,085.76, 3,128.64 and 546.76 is: 820.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.76 : 3,128.64 = 546.76 : x
  2. Step 2: Convert to fraction form
    2,085.76/3,128.64 = 546.76/x
  3. Step 3: Cross multiply
    2,085.76x = 3,128.64 × 546.76
  4. Step 4: Simplify right side
    2,085.76x = 1,710,615.21
  5. Step 5: Solve for x
    x = 1,710,615.21/2,085.76
  6. Step 6: Final answer
    x = 820.14

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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.