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Finding the Fourth Proportional to 1,564.21, 2,344.28 and 638.71

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Solution

The fourth proportional to 1,564.21, 2,344.28 and 638.71 is: 957.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.21 : 2,344.28 = 638.71 : x
  2. Step 2: Convert to fraction form
    1,564.21/2,344.28 = 638.71/x
  3. Step 3: Cross multiply
    1,564.21x = 2,344.28 × 638.71
  4. Step 4: Simplify right side
    1,564.21x = 1,497,310.81
  5. Step 5: Solve for x
    x = 1,497,310.81/1,564.21
  6. Step 6: Final answer
    x = 957.23

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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.