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Finding the Fourth Proportional to 407,978.70, 611,968.05 and 399,230.70

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Solution

The fourth proportional to 407,978.70, 611,968.05 and 399,230.70 is: 598,846.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,978.70 : 611,968.05 = 399,230.70 : x
  2. Step 2: Convert to fraction form
    407,978.70/611,968.05 = 399,230.70/x
  3. Step 3: Cross multiply
    407,978.70x = 611,968.05 × 399,230.70
  4. Step 4: Simplify right side
    407,978.70x = 244,316,432,979.14
  5. Step 5: Solve for x
    x = 244,316,432,979.14/407,978.70
  6. Step 6: Final answer
    x = 598,846.05

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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.