Home / 428,844.84-643,059.27-129,269.58

Finding the Fourth Proportional to 428,844.84, 643,059.27 and 129,269.58

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Solution

The fourth proportional to 428,844.84, 643,059.27 and 129,269.58 is: 193,841.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,844.84 : 643,059.27 = 129,269.58 : x
  2. Step 2: Convert to fraction form
    428,844.84/643,059.27 = 129,269.58/x
  3. Step 3: Cross multiply
    428,844.84x = 643,059.27 × 129,269.58
  4. Step 4: Simplify right side
    428,844.84x = 83,128,001,748.01
  5. Step 5: Solve for x
    x = 83,128,001,748.01/428,844.84
  6. Step 6: Final answer
    x = 193,841.67

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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.