Home / 1,389.36-1,917.12-768.36

Finding the Fourth Proportional to 1,389.36, 1,917.12 and 768.36

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Solution

The fourth proportional to 1,389.36, 1,917.12 and 768.36 is: 1,060.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.36 : 1,917.12 = 768.36 : x
  2. Step 2: Convert to fraction form
    1,389.36/1,917.12 = 768.36/x
  3. Step 3: Cross multiply
    1,389.36x = 1,917.12 × 768.36
  4. Step 4: Simplify right side
    1,389.36x = 1,473,038.32
  5. Step 5: Solve for x
    x = 1,473,038.32/1,389.36
  6. Step 6: Final answer
    x = 1,060.23

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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.