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Finding the Fourth Proportional to 428,065.08, 642,103 and 128,528.22

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Solution

The fourth proportional to 428,065.08, 642,103 and 128,528.22 is: 192,793.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,065.08 : 642,103 = 128,528.22 : x
  2. Step 2: Convert to fraction form
    428,065.08/642,103 = 128,528.22/x
  3. Step 3: Cross multiply
    428,065.08x = 642,103 × 128,528.22
  4. Step 4: Simplify right side
    428,065.08x = 82,528,355,646.66
  5. Step 5: Solve for x
    x = 82,528,355,646.66/428,065.08
  6. Step 6: Final answer
    x = 192,793.95

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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.