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Finding the Fourth Proportional to 1,205.16, 1,805.76 and 717.60

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Solution

The fourth proportional to 1,205.16, 1,805.76 and 717.60 is: 1,075.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.16 : 1,805.76 = 717.60 : x
  2. Step 2: Convert to fraction form
    1,205.16/1,805.76 = 717.60/x
  3. Step 3: Cross multiply
    1,205.16x = 1,805.76 × 717.60
  4. Step 4: Simplify right side
    1,205.16x = 1,295,813.38
  5. Step 5: Solve for x
    x = 1,295,813.38/1,205.16
  6. Step 6: Final answer
    x = 1,075.22

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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.