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Finding the Fourth Proportional to 428,248.98, 642,373.98 and 128,729.58

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Solution

The fourth proportional to 428,248.98, 642,373.98 and 128,729.58 is: 193,094.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,248.98 : 642,373.98 = 128,729.58 : x
  2. Step 2: Convert to fraction form
    428,248.98/642,373.98 = 128,729.58/x
  3. Step 3: Cross multiply
    428,248.98x = 642,373.98 × 128,729.58
  4. Step 4: Simplify right side
    428,248.98x = 82,692,532,648.33
  5. Step 5: Solve for x
    x = 82,692,532,648.33/428,248.98
  6. Step 6: Final answer
    x = 193,094.52

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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.