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Finding the Fourth Proportional to 389,008.89, 580,470.86 and 308,130.39

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Solution

The fourth proportional to 389,008.89, 580,470.86 and 308,130.39 is: 459,785.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,008.89 : 580,470.86 = 308,130.39 : x
  2. Step 2: Convert to fraction form
    389,008.89/580,470.86 = 308,130.39/x
  3. Step 3: Cross multiply
    389,008.89x = 580,470.86 × 308,130.39
  4. Step 4: Simplify right side
    389,008.89x = 178,860,713,245.76
  5. Step 5: Solve for x
    x = 178,860,713,245.76/389,008.89
  6. Step 6: Final answer
    x = 459,785.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.