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Finding the Fourth Proportional to 1,290.76, 1,935.92 and 425.08

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Solution

The fourth proportional to 1,290.76, 1,935.92 and 425.08 is: 637.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.76 : 1,935.92 = 425.08 : x
  2. Step 2: Convert to fraction form
    1,290.76/1,935.92 = 425.08/x
  3. Step 3: Cross multiply
    1,290.76x = 1,935.92 × 425.08
  4. Step 4: Simplify right side
    1,290.76x = 822,920.87
  5. Step 5: Solve for x
    x = 822,920.87/1,290.76
  6. Step 6: Final answer
    x = 637.55

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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.