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Finding the Fourth Proportional to 921.49, 1,382.35 and 305.31

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Solution

The fourth proportional to 921.49, 1,382.35 and 305.31 is: 458.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.49 : 1,382.35 = 305.31 : x
  2. Step 2: Convert to fraction form
    921.49/1,382.35 = 305.31/x
  3. Step 3: Cross multiply
    921.49x = 1,382.35 × 305.31
  4. Step 4: Simplify right side
    921.49x = 422,045.28
  5. Step 5: Solve for x
    x = 422,045.28/921.49
  6. Step 6: Final answer
    x = 458.00

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Half scale
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Double scale
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Similar ratio
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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.