Home / 1,218.47-1,680.80-845.66

Finding the Fourth Proportional to 1,218.47, 1,680.80 and 845.66

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Solution

The fourth proportional to 1,218.47, 1,680.80 and 845.66 is: 1,166.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.47 : 1,680.80 = 845.66 : x
  2. Step 2: Convert to fraction form
    1,218.47/1,680.80 = 845.66/x
  3. Step 3: Cross multiply
    1,218.47x = 1,680.80 × 845.66
  4. Step 4: Simplify right side
    1,218.47x = 1,421,372.70
  5. Step 5: Solve for x
    x = 1,421,372.70/1,218.47
  6. Step 6: Final answer
    x = 1,166.53

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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.