Home / 428,925.38-643,392.70-129,408.56

Finding the Fourth Proportional to 428,925.38, 643,392.70 and 129,408.56

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Solution

The fourth proportional to 428,925.38, 643,392.70 and 129,408.56 is: 194,114.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,925.38 : 643,392.70 = 129,408.56 : x
  2. Step 2: Convert to fraction form
    428,925.38/643,392.70 = 129,408.56/x
  3. Step 3: Cross multiply
    428,925.38x = 643,392.70 × 129,408.56
  4. Step 4: Simplify right side
    428,925.38x = 83,260,522,821.51
  5. Step 5: Solve for x
    x = 83,260,522,821.51/428,925.38
  6. Step 6: Final answer
    x = 194,114.24

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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.