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Finding the Fourth Proportional to 326,368.20, 489,215.49 and 136,938.60

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Solution

The fourth proportional to 326,368.20, 489,215.49 and 136,938.60 is: 205,266.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,368.20 : 489,215.49 = 136,938.60 : x
  2. Step 2: Convert to fraction form
    326,368.20/489,215.49 = 136,938.60/x
  3. Step 3: Cross multiply
    326,368.20x = 489,215.49 × 136,938.60
  4. Step 4: Simplify right side
    326,368.20x = 66,992,484,298.91
  5. Step 5: Solve for x
    x = 66,992,484,298.91/326,368.20
  6. Step 6: Final answer
    x = 205,266.58

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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.