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Finding the Fourth Proportional to 386,969.09, 578,951.89 and 339,225.05

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Solution

The fourth proportional to 386,969.09, 578,951.89 and 339,225.05 is: 507,521.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,969.09 : 578,951.89 = 339,225.05 : x
  2. Step 2: Convert to fraction form
    386,969.09/578,951.89 = 339,225.05/x
  3. Step 3: Cross multiply
    386,969.09x = 578,951.89 × 339,225.05
  4. Step 4: Simplify right side
    386,969.09x = 196,394,984,432.16
  5. Step 5: Solve for x
    x = 196,394,984,432.16/386,969.09
  6. Step 6: Final answer
    x = 507,521.12

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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.