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Finding the Fourth Proportional to 489,940.67, 734,221.80 and 389,655.79

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Solution

The fourth proportional to 489,940.67, 734,221.80 and 389,655.79 is: 583,935.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,940.67 : 734,221.80 = 389,655.79 : x
  2. Step 2: Convert to fraction form
    489,940.67/734,221.80 = 389,655.79/x
  3. Step 3: Cross multiply
    489,940.67x = 734,221.80 × 389,655.79
  4. Step 4: Simplify right side
    489,940.67x = 286,093,773,678.67
  5. Step 5: Solve for x
    x = 286,093,773,678.67/489,940.67
  6. Step 6: Final answer
    x = 583,935.55

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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.