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Finding the Fourth Proportional to 1,564.91, 2,347.99 and 641.10

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Solution

The fourth proportional to 1,564.91, 2,347.99 and 641.10 is: 961.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,564.91 : 2,347.99 = 641.10 : x
  2. Step 2: Convert to fraction form
    1,564.91/2,347.99 = 641.10/x
  3. Step 3: Cross multiply
    1,564.91x = 2,347.99 × 641.10
  4. Step 4: Simplify right side
    1,564.91x = 1,505,303.59
  5. Step 5: Solve for x
    x = 1,505,303.59/1,564.91
  6. Step 6: Final answer
    x = 961.91

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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.