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Finding the Fourth Proportional to 1,394.32, 1,924.20 and 764.80

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Solution

The fourth proportional to 1,394.32, 1,924.20 and 764.80 is: 1,055.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394.32 : 1,924.20 = 764.80 : x
  2. Step 2: Convert to fraction form
    1,394.32/1,924.20 = 764.80/x
  3. Step 3: Cross multiply
    1,394.32x = 1,924.20 × 764.80
  4. Step 4: Simplify right side
    1,394.32x = 1,471,628.16
  5. Step 5: Solve for x
    x = 1,471,628.16/1,394.32
  6. Step 6: Final answer
    x = 1,055.45

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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.