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Finding the Fourth Proportional to 1,173.96, 1,617.06 and 987.24

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Solution

The fourth proportional to 1,173.96, 1,617.06 and 987.24 is: 1,359.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.96 : 1,617.06 = 987.24 : x
  2. Step 2: Convert to fraction form
    1,173.96/1,617.06 = 987.24/x
  3. Step 3: Cross multiply
    1,173.96x = 1,617.06 × 987.24
  4. Step 4: Simplify right side
    1,173.96x = 1,596,426.31
  5. Step 5: Solve for x
    x = 1,596,426.31/1,173.96
  6. Step 6: Final answer
    x = 1,359.86

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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.