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Finding the Fourth Proportional to 328,485.40, 492,857.70 and 128,771.80

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Solution

The fourth proportional to 328,485.40, 492,857.70 and 128,771.80 is: 193,208.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,485.40 : 492,857.70 = 128,771.80 : x
  2. Step 2: Convert to fraction form
    328,485.40/492,857.70 = 128,771.80/x
  3. Step 3: Cross multiply
    328,485.40x = 492,857.70 × 128,771.80
  4. Step 4: Simplify right side
    328,485.40x = 63,466,173,172.86
  5. Step 5: Solve for x
    x = 63,466,173,172.86/328,485.40
  6. Step 6: Final answer
    x = 193,208.51

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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.