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Finding the Fourth Proportional to 328,566.80, 492,485.70 and 128,820.80

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Solution

The fourth proportional to 328,566.80, 492,485.70 and 128,820.80 is: 193,088.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,566.80 : 492,485.70 = 128,820.80 : x
  2. Step 2: Convert to fraction form
    328,566.80/492,485.70 = 128,820.80/x
  3. Step 3: Cross multiply
    328,566.80x = 492,485.70 × 128,820.80
  4. Step 4: Simplify right side
    328,566.80x = 63,442,401,862.56
  5. Step 5: Solve for x
    x = 63,442,401,862.56/328,566.80
  6. Step 6: Final answer
    x = 193,088.29

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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.