Home / 1,396.32-1,925.78-1,239.06

Finding the Fourth Proportional to 1,396.32, 1,925.78 and 1,239.06

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Solution

The fourth proportional to 1,396.32, 1,925.78 and 1,239.06 is: 1,708.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.32 : 1,925.78 = 1,239.06 : x
  2. Step 2: Convert to fraction form
    1,396.32/1,925.78 = 1,239.06/x
  3. Step 3: Cross multiply
    1,396.32x = 1,925.78 × 1,239.06
  4. Step 4: Simplify right side
    1,396.32x = 2,386,156.97
  5. Step 5: Solve for x
    x = 2,386,156.97/1,396.32
  6. Step 6: Final answer
    x = 1,708.89

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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.