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Finding the Fourth Proportional to 1,077.14, 1,615.58 and 643.26

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Solution

The fourth proportional to 1,077.14, 1,615.58 and 643.26 is: 964.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.14 : 1,615.58 = 643.26 : x
  2. Step 2: Convert to fraction form
    1,077.14/1,615.58 = 643.26/x
  3. Step 3: Cross multiply
    1,077.14x = 1,615.58 × 643.26
  4. Step 4: Simplify right side
    1,077.14x = 1,039,237.99
  5. Step 5: Solve for x
    x = 1,039,237.99/1,077.14
  6. Step 6: Final answer
    x = 964.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.