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Finding the Fourth Proportional to 391,015.20, 587,235.60 and 342,026.40

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Solution

The fourth proportional to 391,015.20, 587,235.60 and 342,026.40 is: 513,663.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,015.20 : 587,235.60 = 342,026.40 : x
  2. Step 2: Convert to fraction form
    391,015.20/587,235.60 = 342,026.40/x
  3. Step 3: Cross multiply
    391,015.20x = 587,235.60 × 342,026.40
  4. Step 4: Simplify right side
    391,015.20x = 200,850,078,219.84
  5. Step 5: Solve for x
    x = 200,850,078,219.84/391,015.20
  6. Step 6: Final answer
    x = 513,663.10

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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.