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Finding the Fourth Proportional to 318,030.86, 438,699.84 and 198,591.50

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Solution

The fourth proportional to 318,030.86, 438,699.84 and 198,591.50 is: 273,942.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,030.86 : 438,699.84 = 198,591.50 : x
  2. Step 2: Convert to fraction form
    318,030.86/438,699.84 = 198,591.50/x
  3. Step 3: Cross multiply
    318,030.86x = 438,699.84 × 198,591.50
  4. Step 4: Simplify right side
    318,030.86x = 87,122,059,275.36
  5. Step 5: Solve for x
    x = 87,122,059,275.36/318,030.86
  6. Step 6: Final answer
    x = 273,942.16

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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.