Home / 7,228.20-9,975.78-4,085.40

Finding the Fourth Proportional to 7,228.20, 9,975.78 and 4,085.40

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Solution

The fourth proportional to 7,228.20, 9,975.78 and 4,085.40 is: 5,638.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,228.20 : 9,975.78 = 4,085.40 : x
  2. Step 2: Convert to fraction form
    7,228.20/9,975.78 = 4,085.40/x
  3. Step 3: Cross multiply
    7,228.20x = 9,975.78 × 4,085.40
  4. Step 4: Simplify right side
    7,228.20x = 40,755,051.61
  5. Step 5: Solve for x
    x = 40,755,051.61/7,228.20
  6. Step 6: Final answer
    x = 5,638.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.