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Finding the Fourth Proportional to 1,169.69, 1,755.47 and 642.74

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Solution

The fourth proportional to 1,169.69, 1,755.47 and 642.74 is: 964.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.69 : 1,755.47 = 642.74 : x
  2. Step 2: Convert to fraction form
    1,169.69/1,755.47 = 642.74/x
  3. Step 3: Cross multiply
    1,169.69x = 1,755.47 × 642.74
  4. Step 4: Simplify right side
    1,169.69x = 1,128,303.62
  5. Step 5: Solve for x
    x = 1,128,303.62/1,169.69
  6. Step 6: Final answer
    x = 964.62

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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.