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Finding the Fourth Proportional to 761.00, 1,139.72 and 645.03

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Solution

The fourth proportional to 761.00, 1,139.72 and 645.03 is: 966.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.00 : 1,139.72 = 645.03 : x
  2. Step 2: Convert to fraction form
    761.00/1,139.72 = 645.03/x
  3. Step 3: Cross multiply
    761.00x = 1,139.72 × 645.03
  4. Step 4: Simplify right side
    761.00x = 735,150.37
  5. Step 5: Solve for x
    x = 735,150.37/761.00
  6. Step 6: Final answer
    x = 966.04

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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.