Home / 428,927.32-643,395.30-129,410.38

Finding the Fourth Proportional to 428,927.32, 643,395.30 and 129,410.38

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Solution

The fourth proportional to 428,927.32, 643,395.30 and 129,410.38 is: 194,116.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,927.32 : 643,395.30 = 129,410.38 : x
  2. Step 2: Convert to fraction form
    428,927.32/643,395.30 = 129,410.38/x
  3. Step 3: Cross multiply
    428,927.32x = 643,395.30 × 129,410.38
  4. Step 4: Simplify right side
    428,927.32x = 83,262,030,263.21
  5. Step 5: Solve for x
    x = 83,262,030,263.21/428,927.32
  6. Step 6: Final answer
    x = 194,116.87

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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.