Home / 1,554.35-2,145.31-891.65

Finding the Fourth Proportional to 1,554.35, 2,145.31 and 891.65

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Solution

The fourth proportional to 1,554.35, 2,145.31 and 891.65 is: 1,230.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,554.35 : 2,145.31 = 891.65 : x
  2. Step 2: Convert to fraction form
    1,554.35/2,145.31 = 891.65/x
  3. Step 3: Cross multiply
    1,554.35x = 2,145.31 × 891.65
  4. Step 4: Simplify right side
    1,554.35x = 1,912,865.66
  5. Step 5: Solve for x
    x = 1,912,865.66/1,554.35
  6. Step 6: Final answer
    x = 1,230.65

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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.