Home / 428,191.47-641,849.81-278,731.89

Finding the Fourth Proportional to 428,191.47, 641,849.81 and 278,731.89

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Solution

The fourth proportional to 428,191.47, 641,849.81 and 278,731.89 is: 417,813.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,191.47 : 641,849.81 = 278,731.89 : x
  2. Step 2: Convert to fraction form
    428,191.47/641,849.81 = 278,731.89/x
  3. Step 3: Cross multiply
    428,191.47x = 641,849.81 × 278,731.89
  4. Step 4: Simplify right side
    428,191.47x = 178,904,009,243.78
  5. Step 5: Solve for x
    x = 178,904,009,243.78/428,191.47
  6. Step 6: Final answer
    x = 417,813.11

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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.