Home / 1,390.49-2,075.58-1,215.33

Finding the Fourth Proportional to 1,390.49, 2,075.58 and 1,215.33

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Solution

The fourth proportional to 1,390.49, 2,075.58 and 1,215.33 is: 1,814.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.49 : 2,075.58 = 1,215.33 : x
  2. Step 2: Convert to fraction form
    1,390.49/2,075.58 = 1,215.33/x
  3. Step 3: Cross multiply
    1,390.49x = 2,075.58 × 1,215.33
  4. Step 4: Simplify right side
    1,390.49x = 2,522,514.64
  5. Step 5: Solve for x
    x = 2,522,514.64/1,390.49
  6. Step 6: Final answer
    x = 1,814.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.