Home / 1,210.32-1,669.68-768.90

Finding the Fourth Proportional to 1,210.32, 1,669.68 and 768.90

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Solution

The fourth proportional to 1,210.32, 1,669.68 and 768.90 is: 1,060.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.32 : 1,669.68 = 768.90 : x
  2. Step 2: Convert to fraction form
    1,210.32/1,669.68 = 768.90/x
  3. Step 3: Cross multiply
    1,210.32x = 1,669.68 × 768.90
  4. Step 4: Simplify right side
    1,210.32x = 1,283,816.95
  5. Step 5: Solve for x
    x = 1,283,816.95/1,210.32
  6. Step 6: Final answer
    x = 1,060.73

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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.