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Finding the Fourth Proportional to 428,873.60, 643,310.40 and 113,362.40

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Solution

The fourth proportional to 428,873.60, 643,310.40 and 113,362.40 is: 170,043.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,873.60 : 643,310.40 = 113,362.40 : x
  2. Step 2: Convert to fraction form
    428,873.60/643,310.40 = 113,362.40/x
  3. Step 3: Cross multiply
    428,873.60x = 643,310.40 × 113,362.40
  4. Step 4: Simplify right side
    428,873.60x = 72,927,210,888.96
  5. Step 5: Solve for x
    x = 72,927,210,888.96/428,873.60
  6. Step 6: Final answer
    x = 170,043.60

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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.