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Finding the Fourth Proportional to 386,142.40, 579,213.60 and 372,145.60

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Solution

The fourth proportional to 386,142.40, 579,213.60 and 372,145.60 is: 558,218.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,142.40 : 579,213.60 = 372,145.60 : x
  2. Step 2: Convert to fraction form
    386,142.40/579,213.60 = 372,145.60/x
  3. Step 3: Cross multiply
    386,142.40x = 579,213.60 × 372,145.60
  4. Step 4: Simplify right side
    386,142.40x = 215,551,792,700.16
  5. Step 5: Solve for x
    x = 215,551,792,700.16/386,142.40
  6. Step 6: Final answer
    x = 558,218.40

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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.