Home / 1,210.28-1,670.43-790.70

Finding the Fourth Proportional to 1,210.28, 1,670.43 and 790.70

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Solution

The fourth proportional to 1,210.28, 1,670.43 and 790.70 is: 1,091.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.28 : 1,670.43 = 790.70 : x
  2. Step 2: Convert to fraction form
    1,210.28/1,670.43 = 790.70/x
  3. Step 3: Cross multiply
    1,210.28x = 1,670.43 × 790.70
  4. Step 4: Simplify right side
    1,210.28x = 1,320,800.65
  5. Step 5: Solve for x
    x = 1,320,800.65/1,210.28
  6. Step 6: Final answer
    x = 1,091.32

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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.