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Finding the Fourth Proportional to 718.25, 1,077.57 and 389.11

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Solution

The fourth proportional to 718.25, 1,077.57 and 389.11 is: 583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.25 : 1,077.57 = 389.11 : x
  2. Step 2: Convert to fraction form
    718.25/1,077.57 = 389.11/x
  3. Step 3: Cross multiply
    718.25x = 1,077.57 × 389.11
  4. Step 4: Simplify right side
    718.25x = 419,293.17
  5. Step 5: Solve for x
    x = 419,293.17/718.25
  6. Step 6: Final answer
    x = 583.77

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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.