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Finding the Fourth Proportional to 428,487.60, 642,728.16 and 128,966.88

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Solution

The fourth proportional to 428,487.60, 642,728.16 and 128,966.88 is: 193,449.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,487.60 : 642,728.16 = 128,966.88 : x
  2. Step 2: Convert to fraction form
    428,487.60/642,728.16 = 128,966.88/x
  3. Step 3: Cross multiply
    428,487.60x = 642,728.16 × 128,966.88
  4. Step 4: Simplify right side
    428,487.60x = 82,890,645,483.34
  5. Step 5: Solve for x
    x = 82,890,645,483.34/428,487.60
  6. Step 6: Final answer
    x = 193,449.34

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1.5x scale

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.