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Finding the Fourth Proportional to 696.60, 955.80 and 664.20

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Solution

The fourth proportional to 696.60, 955.80 and 664.20 is: 911.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.60 : 955.80 = 664.20 : x
  2. Step 2: Convert to fraction form
    696.60/955.80 = 664.20/x
  3. Step 3: Cross multiply
    696.60x = 955.80 × 664.20
  4. Step 4: Simplify right side
    696.60x = 634,842.36
  5. Step 5: Solve for x
    x = 634,842.36/696.60
  6. Step 6: Final answer
    x = 911.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.