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Finding the Fourth Proportional to 1,211.58, 1,815.93 and 717.30

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Solution

The fourth proportional to 1,211.58, 1,815.93 and 717.30 is: 1,075.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.58 : 1,815.93 = 717.30 : x
  2. Step 2: Convert to fraction form
    1,211.58/1,815.93 = 717.30/x
  3. Step 3: Cross multiply
    1,211.58x = 1,815.93 × 717.30
  4. Step 4: Simplify right side
    1,211.58x = 1,302,566.59
  5. Step 5: Solve for x
    x = 1,302,566.59/1,211.58
  6. Step 6: Final answer
    x = 1,075.10

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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.