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Finding the Fourth Proportional to 1,874.79, 2,812.65 and 985.37

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Solution

The fourth proportional to 1,874.79, 2,812.65 and 985.37 is: 1,478.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,874.79 : 2,812.65 = 985.37 : x
  2. Step 2: Convert to fraction form
    1,874.79/2,812.65 = 985.37/x
  3. Step 3: Cross multiply
    1,874.79x = 2,812.65 × 985.37
  4. Step 4: Simplify right side
    1,874.79x = 2,771,486.87
  5. Step 5: Solve for x
    x = 2,771,486.87/1,874.79
  6. Step 6: Final answer
    x = 1,478.29

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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.