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Finding the Fourth Proportional to 1,619.34, 2,428.74 and 645.18

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Solution

The fourth proportional to 1,619.34, 2,428.74 and 645.18 is: 967.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.34 : 2,428.74 = 645.18 : x
  2. Step 2: Convert to fraction form
    1,619.34/2,428.74 = 645.18/x
  3. Step 3: Cross multiply
    1,619.34x = 2,428.74 × 645.18
  4. Step 4: Simplify right side
    1,619.34x = 1,566,974.47
  5. Step 5: Solve for x
    x = 1,566,974.47/1,619.34
  6. Step 6: Final answer
    x = 967.66

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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.