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Finding the Fourth Proportional to 1,140.07, 1,709.74 and 490.63

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Solution

The fourth proportional to 1,140.07, 1,709.74 and 490.63 is: 735.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.07 : 1,709.74 = 490.63 : x
  2. Step 2: Convert to fraction form
    1,140.07/1,709.74 = 490.63/x
  3. Step 3: Cross multiply
    1,140.07x = 1,709.74 × 490.63
  4. Step 4: Simplify right side
    1,140.07x = 838,849.74
  5. Step 5: Solve for x
    x = 838,849.74/1,140.07
  6. Step 6: Final answer
    x = 735.79

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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.