Home / 428,912.20-642,785.10-286,352.20

Finding the Fourth Proportional to 428,912.20, 642,785.10 and 286,352.20

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Solution

The fourth proportional to 428,912.20, 642,785.10 and 286,352.20 is: 429,138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,912.20 : 642,785.10 = 286,352.20 : x
  2. Step 2: Convert to fraction form
    428,912.20/642,785.10 = 286,352.20/x
  3. Step 3: Cross multiply
    428,912.20x = 642,785.10 × 286,352.20
  4. Step 4: Simplify right side
    428,912.20x = 184,062,927,512.22
  5. Step 5: Solve for x
    x = 184,062,927,512.22/428,912.20
  6. Step 6: Final answer
    x = 429,138.94

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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.