Home / 428,911.02-643,371.14-129,394.19

Finding the Fourth Proportional to 428,911.02, 643,371.14 and 129,394.19

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Solution

The fourth proportional to 428,911.02, 643,371.14 and 129,394.19 is: 194,092.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,911.02 : 643,371.14 = 129,394.19 : x
  2. Step 2: Convert to fraction form
    428,911.02/643,371.14 = 129,394.19/x
  3. Step 3: Cross multiply
    428,911.02x = 643,371.14 × 129,394.19
  4. Step 4: Simplify right side
    428,911.02x = 83,248,483,665.85
  5. Step 5: Solve for x
    x = 83,248,483,665.85/428,911.02
  6. Step 6: Final answer
    x = 194,092.67

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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.