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Finding the Fourth Proportional to 1,191.40, 1,785.72 and 497.68

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Solution

The fourth proportional to 1,191.40, 1,785.72 and 497.68 is: 745.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.40 : 1,785.72 = 497.68 : x
  2. Step 2: Convert to fraction form
    1,191.40/1,785.72 = 497.68/x
  3. Step 3: Cross multiply
    1,191.40x = 1,785.72 × 497.68
  4. Step 4: Simplify right side
    1,191.40x = 888,717.13
  5. Step 5: Solve for x
    x = 888,717.13/1,191.40
  6. Step 6: Final answer
    x = 745.94

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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.