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Finding the Fourth Proportional to 328,499.80, 492,749.70 and 287,821.60

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Solution

The fourth proportional to 328,499.80, 492,749.70 and 287,821.60 is: 431,732.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,499.80 : 492,749.70 = 287,821.60 : x
  2. Step 2: Convert to fraction form
    328,499.80/492,749.70 = 287,821.60/x
  3. Step 3: Cross multiply
    328,499.80x = 492,749.70 × 287,821.60
  4. Step 4: Simplify right side
    328,499.80x = 141,824,007,053.52
  5. Step 5: Solve for x
    x = 141,824,007,053.52/328,499.80
  6. Step 6: Final answer
    x = 431,732.40

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Similar ratio
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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.