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Finding the Fourth Proportional to 717.72, 1,075.05 and 392.37

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Solution

The fourth proportional to 717.72, 1,075.05 and 392.37 is: 587.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.72 : 1,075.05 = 392.37 : x
  2. Step 2: Convert to fraction form
    717.72/1,075.05 = 392.37/x
  3. Step 3: Cross multiply
    717.72x = 1,075.05 × 392.37
  4. Step 4: Simplify right side
    717.72x = 421,817.37
  5. Step 5: Solve for x
    x = 421,817.37/717.72
  6. Step 6: Final answer
    x = 587.72

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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.