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Finding the Fourth Proportional to 354,647.31, 489,486.13 and 216,849.79

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Solution

The fourth proportional to 354,647.31, 489,486.13 and 216,849.79 is: 299,297.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    354,647.31 : 489,486.13 = 216,849.79 : x
  2. Step 2: Convert to fraction form
    354,647.31/489,486.13 = 216,849.79/x
  3. Step 3: Cross multiply
    354,647.31x = 489,486.13 × 216,849.79
  4. Step 4: Simplify right side
    354,647.31x = 106,144,964,568.15
  5. Step 5: Solve for x
    x = 106,144,964,568.15/354,647.31
  6. Step 6: Final answer
    x = 299,297.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.