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Finding the Fourth Proportional to 1,253.06, 1,728.70 and 811.20

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Solution

The fourth proportional to 1,253.06, 1,728.70 and 811.20 is: 1,119.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.06 : 1,728.70 = 811.20 : x
  2. Step 2: Convert to fraction form
    1,253.06/1,728.70 = 811.20/x
  3. Step 3: Cross multiply
    1,253.06x = 1,728.70 × 811.20
  4. Step 4: Simplify right side
    1,253.06x = 1,402,321.44
  5. Step 5: Solve for x
    x = 1,402,321.44/1,253.06
  6. Step 6: Final answer
    x = 1,119.12

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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.