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Finding the Fourth Proportional to 2,286.76, 3,430.74 and 987.92

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Solution

The fourth proportional to 2,286.76, 3,430.74 and 987.92 is: 1,482.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,286.76 : 3,430.74 = 987.92 : x
  2. Step 2: Convert to fraction form
    2,286.76/3,430.74 = 987.92/x
  3. Step 3: Cross multiply
    2,286.76x = 3,430.74 × 987.92
  4. Step 4: Simplify right side
    2,286.76x = 3,389,296.66
  5. Step 5: Solve for x
    x = 3,389,296.66/2,286.76
  6. Step 6: Final answer
    x = 1,482.14

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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.