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Finding the Fourth Proportional to 857.92, 1,287.02 and 425.08

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Solution

The fourth proportional to 857.92, 1,287.02 and 425.08 is: 637.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.92 : 1,287.02 = 425.08 : x
  2. Step 2: Convert to fraction form
    857.92/1,287.02 = 425.08/x
  3. Step 3: Cross multiply
    857.92x = 1,287.02 × 425.08
  4. Step 4: Simplify right side
    857.92x = 547,086.46
  5. Step 5: Solve for x
    x = 547,086.46/857.92
  6. Step 6: Final answer
    x = 637.69

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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.