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Finding the Fourth Proportional to 326,420.80, 489,631.20 and 313,979.20

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Solution

The fourth proportional to 326,420.80, 489,631.20 and 313,979.20 is: 470,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,420.80 : 489,631.20 = 313,979.20 : x
  2. Step 2: Convert to fraction form
    326,420.80/489,631.20 = 313,979.20/x
  3. Step 3: Cross multiply
    326,420.80x = 489,631.20 × 313,979.20
  4. Step 4: Simplify right side
    326,420.80x = 153,734,012,471.04
  5. Step 5: Solve for x
    x = 153,734,012,471.04/326,420.80
  6. Step 6: Final answer
    x = 470,968.80

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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.