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Finding the Fourth Proportional to 1,139.24, 1,709.10 and 591.68

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Solution

The fourth proportional to 1,139.24, 1,709.10 and 591.68 is: 887.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.24 : 1,709.10 = 591.68 : x
  2. Step 2: Convert to fraction form
    1,139.24/1,709.10 = 591.68/x
  3. Step 3: Cross multiply
    1,139.24x = 1,709.10 × 591.68
  4. Step 4: Simplify right side
    1,139.24x = 1,011,240.29
  5. Step 5: Solve for x
    x = 1,011,240.29/1,139.24
  6. Step 6: Final answer
    x = 887.64

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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.