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Finding the Fourth Proportional to 1,009.60, 1,394.31 and 695.69

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Solution

The fourth proportional to 1,009.60, 1,394.31 and 695.69 is: 960.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.60 : 1,394.31 = 695.69 : x
  2. Step 2: Convert to fraction form
    1,009.60/1,394.31 = 695.69/x
  3. Step 3: Cross multiply
    1,009.60x = 1,394.31 × 695.69
  4. Step 4: Simplify right side
    1,009.60x = 970,008.39
  5. Step 5: Solve for x
    x = 970,008.39/1,009.60
  6. Step 6: Final answer
    x = 960.79

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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.