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Finding the Fourth Proportional to 315,090.40, 472,693.20 and 128,120.80

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Solution

The fourth proportional to 315,090.40, 472,693.20 and 128,120.80 is: 192,204.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,090.40 : 472,693.20 = 128,120.80 : x
  2. Step 2: Convert to fraction form
    315,090.40/472,693.20 = 128,120.80/x
  3. Step 3: Cross multiply
    315,090.40x = 472,693.20 × 128,120.80
  4. Step 4: Simplify right side
    315,090.40x = 60,561,830,938.56
  5. Step 5: Solve for x
    x = 60,561,830,938.56/315,090.40
  6. Step 6: Final answer
    x = 192,204.62

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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.