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Finding the Fourth Proportional to 1,270.76, 1,752.10 and 828.48

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Solution

The fourth proportional to 1,270.76, 1,752.10 and 828.48 is: 1,142.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.76 : 1,752.10 = 828.48 : x
  2. Step 2: Convert to fraction form
    1,270.76/1,752.10 = 828.48/x
  3. Step 3: Cross multiply
    1,270.76x = 1,752.10 × 828.48
  4. Step 4: Simplify right side
    1,270.76x = 1,451,579.81
  5. Step 5: Solve for x
    x = 1,451,579.81/1,270.76
  6. Step 6: Final answer
    x = 1,142.29

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Half scale
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Double scale
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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.