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Finding the Fourth Proportional to 1,139.63, 1,709.97 and 619.61

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Solution

The fourth proportional to 1,139.63, 1,709.97 and 619.61 is: 929.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.63 : 1,709.97 = 619.61 : x
  2. Step 2: Convert to fraction form
    1,139.63/1,709.97 = 619.61/x
  3. Step 3: Cross multiply
    1,139.63x = 1,709.97 × 619.61
  4. Step 4: Simplify right side
    1,139.63x = 1,059,505.96
  5. Step 5: Solve for x
    x = 1,059,505.96/1,139.63
  6. Step 6: Final answer
    x = 929.70

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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.