Home / 1,540.16-2,125.40-858.81

Finding the Fourth Proportional to 1,540.16, 2,125.40 and 858.81

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Solution

The fourth proportional to 1,540.16, 2,125.40 and 858.81 is: 1,185.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.16 : 2,125.40 = 858.81 : x
  2. Step 2: Convert to fraction form
    1,540.16/2,125.40 = 858.81/x
  3. Step 3: Cross multiply
    1,540.16x = 2,125.40 × 858.81
  4. Step 4: Simplify right side
    1,540.16x = 1,825,314.77
  5. Step 5: Solve for x
    x = 1,825,314.77/1,540.16
  6. Step 6: Final answer
    x = 1,185.15

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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.