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Finding the Fourth Proportional to 1,139.57, 1,709.75 and 703.64

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Solution

The fourth proportional to 1,139.57, 1,709.75 and 703.64 is: 1,055.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.57 : 1,709.75 = 703.64 : x
  2. Step 2: Convert to fraction form
    1,139.57/1,709.75 = 703.64/x
  3. Step 3: Cross multiply
    1,139.57x = 1,709.75 × 703.64
  4. Step 4: Simplify right side
    1,139.57x = 1,203,048.49
  5. Step 5: Solve for x
    x = 1,203,048.49/1,139.57
  6. Step 6: Final answer
    x = 1,055.70

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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.