Home / 1,815.12-2,501.82-1,389.60

Finding the Fourth Proportional to 1,815.12, 2,501.82 and 1,389.60

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Solution

The fourth proportional to 1,815.12, 2,501.82 and 1,389.60 is: 1,915.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.12 : 2,501.82 = 1,389.60 : x
  2. Step 2: Convert to fraction form
    1,815.12/2,501.82 = 1,389.60/x
  3. Step 3: Cross multiply
    1,815.12x = 2,501.82 × 1,389.60
  4. Step 4: Simplify right side
    1,815.12x = 3,476,529.07
  5. Step 5: Solve for x
    x = 3,476,529.07/1,815.12
  6. Step 6: Final answer
    x = 1,915.32

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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.