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Finding the Fourth Proportional to 428,970.80, 643,456.20 and 113,459.60

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Solution

The fourth proportional to 428,970.80, 643,456.20 and 113,459.60 is: 170,189.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,970.80 : 643,456.20 = 113,459.60 : x
  2. Step 2: Convert to fraction form
    428,970.80/643,456.20 = 113,459.60/x
  3. Step 3: Cross multiply
    428,970.80x = 643,456.20 × 113,459.60
  4. Step 4: Simplify right side
    428,970.80x = 73,006,283,069.52
  5. Step 5: Solve for x
    x = 73,006,283,069.52/428,970.80
  6. Step 6: Final answer
    x = 170,189.40

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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.