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Finding the Fourth Proportional to 1,287.62, 1,776.45 and 845.76

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Solution

The fourth proportional to 1,287.62, 1,776.45 and 845.76 is: 1,166.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.62 : 1,776.45 = 845.76 : x
  2. Step 2: Convert to fraction form
    1,287.62/1,776.45 = 845.76/x
  3. Step 3: Cross multiply
    1,287.62x = 1,776.45 × 845.76
  4. Step 4: Simplify right side
    1,287.62x = 1,502,450.35
  5. Step 5: Solve for x
    x = 1,502,450.35/1,287.62
  6. Step 6: Final answer
    x = 1,166.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.