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Finding the Fourth Proportional to 326,921.40, 490,382.10 and 287,555.40

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Solution

The fourth proportional to 326,921.40, 490,382.10 and 287,555.40 is: 431,333.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,921.40 : 490,382.10 = 287,555.40 : x
  2. Step 2: Convert to fraction form
    326,921.40/490,382.10 = 287,555.40/x
  3. Step 3: Cross multiply
    326,921.40x = 490,382.10 × 287,555.40
  4. Step 4: Simplify right side
    326,921.40x = 141,012,020,918.34
  5. Step 5: Solve for x
    x = 141,012,020,918.34/326,921.40
  6. Step 6: Final answer
    x = 431,333.10

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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.