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Finding the Fourth Proportional to 428,275.72, 642,194.84 and 158,390.20

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Solution

The fourth proportional to 428,275.72, 642,194.84 and 158,390.20 is: 237,504.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,275.72 : 642,194.84 = 158,390.20 : x
  2. Step 2: Convert to fraction form
    428,275.72/642,194.84 = 158,390.20/x
  3. Step 3: Cross multiply
    428,275.72x = 642,194.84 × 158,390.20
  4. Step 4: Simplify right side
    428,275.72x = 101,717,369,146.57
  5. Step 5: Solve for x
    x = 101,717,369,146.57/428,275.72
  6. Step 6: Final answer
    x = 237,504.40

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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.