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Finding the Fourth Proportional to 393,032.43, 589,055.31 and 168,128.55

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Solution

The fourth proportional to 393,032.43, 589,055.31 and 168,128.55 is: 251,981.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,032.43 : 589,055.31 = 168,128.55 : x
  2. Step 2: Convert to fraction form
    393,032.43/589,055.31 = 168,128.55/x
  3. Step 3: Cross multiply
    393,032.43x = 589,055.31 × 168,128.55
  4. Step 4: Simplify right side
    393,032.43x = 99,037,015,140.10
  5. Step 5: Solve for x
    x = 99,037,015,140.10/393,032.43
  6. Step 6: Final answer
    x = 251,981.79

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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.