Home / 428,632.76-642,984.21-215,290.98

Finding the Fourth Proportional to 428,632.76, 642,984.21 and 215,290.98

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Solution

The fourth proportional to 428,632.76, 642,984.21 and 215,290.98 is: 322,954.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,632.76 : 642,984.21 = 215,290.98 : x
  2. Step 2: Convert to fraction form
    428,632.76/642,984.21 = 215,290.98/x
  3. Step 3: Cross multiply
    428,632.76x = 642,984.21 × 215,290.98
  4. Step 4: Simplify right side
    428,632.76x = 138,428,700,695.43
  5. Step 5: Solve for x
    x = 138,428,700,695.43/428,632.76
  6. Step 6: Final answer
    x = 322,954.08

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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.