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Finding the Fourth Proportional to 638,997.23, 957,990.81 and 318,984.86

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Solution

The fourth proportional to 638,997.23, 957,990.81 and 318,984.86 is: 478,225.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,997.23 : 957,990.81 = 318,984.86 : x
  2. Step 2: Convert to fraction form
    638,997.23/957,990.81 = 318,984.86/x
  3. Step 3: Cross multiply
    638,997.23x = 957,990.81 × 318,984.86
  4. Step 4: Simplify right side
    638,997.23x = 305,584,564,409.14
  5. Step 5: Solve for x
    x = 305,584,564,409.14/638,997.23
  6. Step 6: Final answer
    x = 478,225.18

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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.