Home / 7,128.61-9,839.58-4,145.58

Finding the Fourth Proportional to 7,128.61, 9,839.58 and 4,145.58

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Solution

The fourth proportional to 7,128.61, 9,839.58 and 4,145.58 is: 5,722.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.61 : 9,839.58 = 4,145.58 : x
  2. Step 2: Convert to fraction form
    7,128.61/9,839.58 = 4,145.58/x
  3. Step 3: Cross multiply
    7,128.61x = 9,839.58 × 4,145.58
  4. Step 4: Simplify right side
    7,128.61x = 40,790,750.51
  5. Step 5: Solve for x
    x = 40,790,750.51/7,128.61
  6. Step 6: Final answer
    x = 5,722.12

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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.