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Finding the Fourth Proportional to 1,115.01, 1,668.63 and 675.99

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Solution

The fourth proportional to 1,115.01, 1,668.63 and 675.99 is: 1,011.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.01 : 1,668.63 = 675.99 : x
  2. Step 2: Convert to fraction form
    1,115.01/1,668.63 = 675.99/x
  3. Step 3: Cross multiply
    1,115.01x = 1,668.63 × 675.99
  4. Step 4: Simplify right side
    1,115.01x = 1,127,977.19
  5. Step 5: Solve for x
    x = 1,127,977.19/1,115.01
  6. Step 6: Final answer
    x = 1,011.63

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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.