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Finding the Fourth Proportional to 1,322.82, 1,984.14 and 398.35

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Solution

The fourth proportional to 1,322.82, 1,984.14 and 398.35 is: 597.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.82 : 1,984.14 = 398.35 : x
  2. Step 2: Convert to fraction form
    1,322.82/1,984.14 = 398.35/x
  3. Step 3: Cross multiply
    1,322.82x = 1,984.14 × 398.35
  4. Step 4: Simplify right side
    1,322.82x = 790,382.17
  5. Step 5: Solve for x
    x = 790,382.17/1,322.82
  6. Step 6: Final answer
    x = 597.50

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