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Finding the Fourth Proportional to 1,272.76, 1,755.74 and 775.28

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Solution

The fourth proportional to 1,272.76, 1,755.74 and 775.28 is: 1,069.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.76 : 1,755.74 = 775.28 : x
  2. Step 2: Convert to fraction form
    1,272.76/1,755.74 = 775.28/x
  3. Step 3: Cross multiply
    1,272.76x = 1,755.74 × 775.28
  4. Step 4: Simplify right side
    1,272.76x = 1,361,190.11
  5. Step 5: Solve for x
    x = 1,361,190.11/1,272.76
  6. Step 6: Final answer
    x = 1,069.48

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Find fourth proportional to 636.38, 877.87 and 387.64
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.