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Finding the Fourth Proportional to 1,139.00, 1,571.54 and 641.63

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Solution

The fourth proportional to 1,139.00, 1,571.54 and 641.63 is: 885.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.00 : 1,571.54 = 641.63 : x
  2. Step 2: Convert to fraction form
    1,139.00/1,571.54 = 641.63/x
  3. Step 3: Cross multiply
    1,139.00x = 1,571.54 × 641.63
  4. Step 4: Simplify right side
    1,139.00x = 1,008,352.08
  5. Step 5: Solve for x
    x = 1,008,352.08/1,139.00
  6. Step 6: Final answer
    x = 885.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.