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Finding the Fourth Proportional to 1,564.70, 2,345.22 and 639.81

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Solution

The fourth proportional to 1,564.70, 2,345.22 and 639.81 is: 958.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.70 : 2,345.22 = 639.81 : x
  2. Step 2: Convert to fraction form
    1,564.70/2,345.22 = 639.81/x
  3. Step 3: Cross multiply
    1,564.70x = 2,345.22 × 639.81
  4. Step 4: Simplify right side
    1,564.70x = 1,500,495.21
  5. Step 5: Solve for x
    x = 1,500,495.21/1,564.70
  6. Step 6: Final answer
    x = 958.97

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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.