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Finding the Fourth Proportional to 1,172.18, 1,617.90 and 857.90

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Solution

The fourth proportional to 1,172.18, 1,617.90 and 857.90 is: 1,184.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.18 : 1,617.90 = 857.90 : x
  2. Step 2: Convert to fraction form
    1,172.18/1,617.90 = 857.90/x
  3. Step 3: Cross multiply
    1,172.18x = 1,617.90 × 857.90
  4. Step 4: Simplify right side
    1,172.18x = 1,387,996.41
  5. Step 5: Solve for x
    x = 1,387,996.41/1,172.18
  6. Step 6: Final answer
    x = 1,184.12

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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.