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Finding the Fourth Proportional to 392,281.20, 587,255.40 and 369,212.40

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Solution

The fourth proportional to 392,281.20, 587,255.40 and 369,212.40 is: 552,720.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,281.20 : 587,255.40 = 369,212.40 : x
  2. Step 2: Convert to fraction form
    392,281.20/587,255.40 = 369,212.40/x
  3. Step 3: Cross multiply
    392,281.20x = 587,255.40 × 369,212.40
  4. Step 4: Simplify right side
    392,281.20x = 216,821,975,646.96
  5. Step 5: Solve for x
    x = 216,821,975,646.96/392,281.20
  6. Step 6: Final answer
    x = 552,720.79

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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.