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Finding the Fourth Proportional to 613,905.40, 920,858.10 and 259,319.80

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Solution

The fourth proportional to 613,905.40, 920,858.10 and 259,319.80 is: 388,979.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,905.40 : 920,858.10 = 259,319.80 : x
  2. Step 2: Convert to fraction form
    613,905.40/920,858.10 = 259,319.80/x
  3. Step 3: Cross multiply
    613,905.40x = 920,858.10 × 259,319.80
  4. Step 4: Simplify right side
    613,905.40x = 238,796,738,320.38
  5. Step 5: Solve for x
    x = 238,796,738,320.38/613,905.40
  6. Step 6: Final answer
    x = 388,979.70

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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.