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Finding the Fourth Proportional to 318,021.99, 438,607.47 and 215,879.57

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Solution

The fourth proportional to 318,021.99, 438,607.47 and 215,879.57 is: 297,735.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,021.99 : 438,607.47 = 215,879.57 : x
  2. Step 2: Convert to fraction form
    318,021.99/438,607.47 = 215,879.57/x
  3. Step 3: Cross multiply
    318,021.99x = 438,607.47 × 215,879.57
  4. Step 4: Simplify right side
    318,021.99x = 94,686,392,022.39
  5. Step 5: Solve for x
    x = 94,686,392,022.39/318,021.99
  6. Step 6: Final answer
    x = 297,735.36

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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.