Home / 428,041.24-642,089.50-143,720.30

Finding the Fourth Proportional to 428,041.24, 642,089.50 and 143,720.30

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Solution

The fourth proportional to 428,041.24, 642,089.50 and 143,720.30 is: 215,589.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,041.24 : 642,089.50 = 143,720.30 : x
  2. Step 2: Convert to fraction form
    428,041.24/642,089.50 = 143,720.30/x
  3. Step 3: Cross multiply
    428,041.24x = 642,089.50 × 143,720.30
  4. Step 4: Simplify right side
    428,041.24x = 92,281,295,566.85
  5. Step 5: Solve for x
    x = 92,281,295,566.85/428,041.24
  6. Step 6: Final answer
    x = 215,589.73

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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.