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Finding the Fourth Proportional to 1,262.55, 1,892.97 and 645.06

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Solution

The fourth proportional to 1,262.55, 1,892.97 and 645.06 is: 967.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,262.55 : 1,892.97 = 645.06 : x
  2. Step 2: Convert to fraction form
    1,262.55/1,892.97 = 645.06/x
  3. Step 3: Cross multiply
    1,262.55x = 1,892.97 × 645.06
  4. Step 4: Simplify right side
    1,262.55x = 1,221,079.23
  5. Step 5: Solve for x
    x = 1,221,079.23/1,262.55
  6. Step 6: Final answer
    x = 967.15

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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.