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Finding the Fourth Proportional to 326,431.80, 489,647.70 and 302,812.20

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Solution

The fourth proportional to 326,431.80, 489,647.70 and 302,812.20 is: 454,218.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,431.80 : 489,647.70 = 302,812.20 : x
  2. Step 2: Convert to fraction form
    326,431.80/489,647.70 = 302,812.20/x
  3. Step 3: Cross multiply
    326,431.80x = 489,647.70 × 302,812.20
  4. Step 4: Simplify right side
    326,431.80x = 148,271,297,261.94
  5. Step 5: Solve for x
    x = 148,271,297,261.94/326,431.80
  6. Step 6: Final answer
    x = 454,218.30

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1.5x scale

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.