Home / 428,781.60-643,159.20-113,240.16

Finding the Fourth Proportional to 428,781.60, 643,159.20 and 113,240.16

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Solution

The fourth proportional to 428,781.60, 643,159.20 and 113,240.16 is: 169,856.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,781.60 : 643,159.20 = 113,240.16 : x
  2. Step 2: Convert to fraction form
    428,781.60/643,159.20 = 113,240.16/x
  3. Step 3: Cross multiply
    428,781.60x = 643,159.20 × 113,240.16
  4. Step 4: Simplify right side
    428,781.60x = 72,831,450,713.47
  5. Step 5: Solve for x
    x = 72,831,450,713.47/428,781.60
  6. Step 6: Final answer
    x = 169,856.75

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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.