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Finding the Fourth Proportional to 638,995.23, 957,987.81 and 318,982.86

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Solution

The fourth proportional to 638,995.23, 957,987.81 and 318,982.86 is: 478,222.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,995.23 : 957,987.81 = 318,982.86 : x
  2. Step 2: Convert to fraction form
    638,995.23/957,987.81 = 318,982.86/x
  3. Step 3: Cross multiply
    638,995.23x = 957,987.81 × 318,982.86
  4. Step 4: Simplify right side
    638,995.23x = 305,581,691,478.94
  5. Step 5: Solve for x
    x = 305,581,691,478.94/638,995.23
  6. Step 6: Final answer
    x = 478,222.18

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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.