Home / 1,986.45-2,979.81-525.57

Finding the Fourth Proportional to 1,986.45, 2,979.81 and 525.57

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Solution

The fourth proportional to 1,986.45, 2,979.81 and 525.57 is: 788.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.45 : 2,979.81 = 525.57 : x
  2. Step 2: Convert to fraction form
    1,986.45/2,979.81 = 525.57/x
  3. Step 3: Cross multiply
    1,986.45x = 2,979.81 × 525.57
  4. Step 4: Simplify right side
    1,986.45x = 1,566,098.74
  5. Step 5: Solve for x
    x = 1,566,098.74/1,986.45
  6. Step 6: Final answer
    x = 788.39

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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.