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Finding the Fourth Proportional to 1,172.96, 1,617.36 and 877.28

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Solution

The fourth proportional to 1,172.96, 1,617.36 and 877.28 is: 1,209.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.96 : 1,617.36 = 877.28 : x
  2. Step 2: Convert to fraction form
    1,172.96/1,617.36 = 877.28/x
  3. Step 3: Cross multiply
    1,172.96x = 1,617.36 × 877.28
  4. Step 4: Simplify right side
    1,172.96x = 1,418,877.58
  5. Step 5: Solve for x
    x = 1,418,877.58/1,172.96
  6. Step 6: Final answer
    x = 1,209.66

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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.