Home / 1,398.16-1,929.51-768.75

Finding the Fourth Proportional to 1,398.16, 1,929.51 and 768.75

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Solution

The fourth proportional to 1,398.16, 1,929.51 and 768.75 is: 1,060.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.16 : 1,929.51 = 768.75 : x
  2. Step 2: Convert to fraction form
    1,398.16/1,929.51 = 768.75/x
  3. Step 3: Cross multiply
    1,398.16x = 1,929.51 × 768.75
  4. Step 4: Simplify right side
    1,398.16x = 1,483,310.81
  5. Step 5: Solve for x
    x = 1,483,310.81/1,398.16
  6. Step 6: Final answer
    x = 1,060.90

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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.