Home / 428,948.96-643,215.44-129,374.24

Finding the Fourth Proportional to 428,948.96, 643,215.44 and 129,374.24

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Solution

The fourth proportional to 428,948.96, 643,215.44 and 129,374.24 is: 193,998.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,948.96 : 643,215.44 = 129,374.24 : x
  2. Step 2: Convert to fraction form
    428,948.96/643,215.44 = 129,374.24/x
  3. Step 3: Cross multiply
    428,948.96x = 643,215.44 × 129,374.24
  4. Step 4: Simplify right side
    428,948.96x = 83,215,508,706.27
  5. Step 5: Solve for x
    x = 83,215,508,706.27/428,948.96
  6. Step 6: Final answer
    x = 193,998.63

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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.