Home / 428,911.20-642,783.60-286,351.20

Finding the Fourth Proportional to 428,911.20, 642,783.60 and 286,351.20

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Solution

The fourth proportional to 428,911.20, 642,783.60 and 286,351.20 is: 429,137.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,911.20 : 642,783.60 = 286,351.20 : x
  2. Step 2: Convert to fraction form
    428,911.20/642,783.60 = 286,351.20/x
  3. Step 3: Cross multiply
    428,911.20x = 642,783.60 × 286,351.20
  4. Step 4: Simplify right side
    428,911.20x = 184,061,855,200.32
  5. Step 5: Solve for x
    x = 184,061,855,200.32/428,911.20
  6. Step 6: Final answer
    x = 429,137.44

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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.