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Finding the Fourth Proportional to 491,434.92, 678,389.44 and 330,383.38

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Solution

The fourth proportional to 491,434.92, 678,389.44 and 330,383.38 is: 456,069.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,434.92 : 678,389.44 = 330,383.38 : x
  2. Step 2: Convert to fraction form
    491,434.92/678,389.44 = 330,383.38/x
  3. Step 3: Cross multiply
    491,434.92x = 678,389.44 × 330,383.38
  4. Step 4: Simplify right side
    491,434.92x = 224,128,596,143.51
  5. Step 5: Solve for x
    x = 224,128,596,143.51/491,434.92
  6. Step 6: Final answer
    x = 456,069.74

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Double scale
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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.