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Finding the Fourth Proportional to 955.20, 1,339.20 and 955.20

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Solution

The fourth proportional to 955.20, 1,339.20 and 955.20 is: 1,339.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.20 : 1,339.20 = 955.20 : x
  2. Step 2: Convert to fraction form
    955.20/1,339.20 = 955.20/x
  3. Step 3: Cross multiply
    955.20x = 1,339.20 × 955.20
  4. Step 4: Simplify right side
    955.20x = 1,279,203.84
  5. Step 5: Solve for x
    x = 1,279,203.84/955.20
  6. Step 6: Final answer
    x = 1,339.20

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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 (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.