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Finding the Fourth Proportional to 1,139.46, 1,708.00 and 645.25

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Solution

The fourth proportional to 1,139.46, 1,708.00 and 645.25 is: 967.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.46 : 1,708.00 = 645.25 : x
  2. Step 2: Convert to fraction form
    1,139.46/1,708.00 = 645.25/x
  3. Step 3: Cross multiply
    1,139.46x = 1,708.00 × 645.25
  4. Step 4: Simplify right side
    1,139.46x = 1,102,084.99
  5. Step 5: Solve for x
    x = 1,102,084.99/1,139.46
  6. Step 6: Final answer
    x = 967.20

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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.