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Finding the Fourth Proportional to 4,272.90, 6,409.35 and 2,085.90

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Solution

The fourth proportional to 4,272.90, 6,409.35 and 2,085.90 is: 3,128.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,272.90 : 6,409.35 = 2,085.90 : x
  2. Step 2: Convert to fraction form
    4,272.90/6,409.35 = 2,085.90/x
  3. Step 3: Cross multiply
    4,272.90x = 6,409.35 × 2,085.90
  4. Step 4: Simplify right side
    4,272.90x = 13,369,263.17
  5. Step 5: Solve for x
    x = 13,369,263.17/4,272.90
  6. Step 6: Final answer
    x = 3,128.85

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1.5x scale

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.