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Finding the Fourth Proportional to 1,372.16, 1,892.61 and 874.94

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Solution

The fourth proportional to 1,372.16, 1,892.61 and 874.94 is: 1,206.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.16 : 1,892.61 = 874.94 : x
  2. Step 2: Convert to fraction form
    1,372.16/1,892.61 = 874.94/x
  3. Step 3: Cross multiply
    1,372.16x = 1,892.61 × 874.94
  4. Step 4: Simplify right side
    1,372.16x = 1,655,920.19
  5. Step 5: Solve for x
    x = 1,655,920.19/1,372.16
  6. Step 6: Final answer
    x = 1,206.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.