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Finding the Fourth Proportional to 717.54, 1,075.04 and 393.12

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Solution

The fourth proportional to 717.54, 1,075.04 and 393.12 is: 588.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.54 : 1,075.04 = 393.12 : x
  2. Step 2: Convert to fraction form
    717.54/1,075.04 = 393.12/x
  3. Step 3: Cross multiply
    717.54x = 1,075.04 × 393.12
  4. Step 4: Simplify right side
    717.54x = 422,619.72
  5. Step 5: Solve for x
    x = 422,619.72/717.54
  6. Step 6: Final answer
    x = 588.98

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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.