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Finding the Fourth Proportional to 318,030.36, 438,699.15 and 198,591

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Solution

The fourth proportional to 318,030.36, 438,699.15 and 198,591 is: 273,941.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,030.36 : 438,699.15 = 198,591 : x
  2. Step 2: Convert to fraction form
    318,030.36/438,699.15 = 198,591/x
  3. Step 3: Cross multiply
    318,030.36x = 438,699.15 × 198,591
  4. Step 4: Simplify right side
    318,030.36x = 87,121,702,897.65
  5. Step 5: Solve for x
    x = 87,121,702,897.65/318,030.36
  6. Step 6: Final answer
    x = 273,941.47

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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.