Home / 428,702.54-643,053.47-129,183.12

Finding the Fourth Proportional to 428,702.54, 643,053.47 and 129,183.12

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Solution

The fourth proportional to 428,702.54, 643,053.47 and 129,183.12 is: 193,774.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,702.54 : 643,053.47 = 129,183.12 : x
  2. Step 2: Convert to fraction form
    428,702.54/643,053.47 = 129,183.12/x
  3. Step 3: Cross multiply
    428,702.54x = 643,053.47 × 129,183.12
  4. Step 4: Simplify right side
    428,702.54x = 83,071,652,935.51
  5. Step 5: Solve for x
    x = 83,071,652,935.51/428,702.54
  6. Step 6: Final answer
    x = 193,774.58

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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.