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Finding the Fourth Proportional to 1,618.17, 2,428.25 and 644.36

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Solution

The fourth proportional to 1,618.17, 2,428.25 and 644.36 is: 966.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618.17 : 2,428.25 = 644.36 : x
  2. Step 2: Convert to fraction form
    1,618.17/2,428.25 = 644.36/x
  3. Step 3: Cross multiply
    1,618.17x = 2,428.25 × 644.36
  4. Step 4: Simplify right side
    1,618.17x = 1,564,651.81
  5. Step 5: Solve for x
    x = 1,564,651.81/1,618.17
  6. Step 6: Final answer
    x = 966.93

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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.