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Finding the Fourth Proportional to 876.10, 1,208.58 and 813.57

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Solution

The fourth proportional to 876.10, 1,208.58 and 813.57 is: 1,122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.10 : 1,208.58 = 813.57 : x
  2. Step 2: Convert to fraction form
    876.10/1,208.58 = 813.57/x
  3. Step 3: Cross multiply
    876.10x = 1,208.58 × 813.57
  4. Step 4: Simplify right side
    876.10x = 983,264.43
  5. Step 5: Solve for x
    x = 983,264.43/876.10
  6. Step 6: Final answer
    x = 1,122.32

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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.