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Finding the Fourth Proportional to 1,874.82, 2,812.46 and 642.51

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Solution

The fourth proportional to 1,874.82, 2,812.46 and 642.51 is: 963.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,874.82 : 2,812.46 = 642.51 : x
  2. Step 2: Convert to fraction form
    1,874.82/2,812.46 = 642.51/x
  3. Step 3: Cross multiply
    1,874.82x = 2,812.46 × 642.51
  4. Step 4: Simplify right side
    1,874.82x = 1,807,030.46
  5. Step 5: Solve for x
    x = 1,807,030.46/1,874.82
  6. Step 6: Final answer
    x = 963.84

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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.