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Finding the Fourth Proportional to 1,618.68, 2,429 and 644.86

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Solution

The fourth proportional to 1,618.68, 2,429 and 644.86 is: 967.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618.68 : 2,429 = 644.86 : x
  2. Step 2: Convert to fraction form
    1,618.68/2,429 = 644.86/x
  3. Step 3: Cross multiply
    1,618.68x = 2,429 × 644.86
  4. Step 4: Simplify right side
    1,618.68x = 1,566,364.94
  5. Step 5: Solve for x
    x = 1,566,364.94/1,618.68
  6. Step 6: Final answer
    x = 967.68

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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.