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Finding the Fourth Proportional to 392,381.20, 587,016.60 and 340,368.40

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Solution

The fourth proportional to 392,381.20, 587,016.60 and 340,368.40 is: 509,203.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,381.20 : 587,016.60 = 340,368.40 : x
  2. Step 2: Convert to fraction form
    392,381.20/587,016.60 = 340,368.40/x
  3. Step 3: Cross multiply
    392,381.20x = 587,016.60 × 340,368.40
  4. Step 4: Simplify right side
    392,381.20x = 199,801,900,915.44
  5. Step 5: Solve for x
    x = 199,801,900,915.44/392,381.20
  6. Step 6: Final answer
    x = 509,203.55

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1.5x scale

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.