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Finding the Fourth Proportional to 1,578.45, 2,176.07 and 988.59

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Solution

The fourth proportional to 1,578.45, 2,176.07 and 988.59 is: 1,362.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.45 : 2,176.07 = 988.59 : x
  2. Step 2: Convert to fraction form
    1,578.45/2,176.07 = 988.59/x
  3. Step 3: Cross multiply
    1,578.45x = 2,176.07 × 988.59
  4. Step 4: Simplify right side
    1,578.45x = 2,151,236.10
  5. Step 5: Solve for x
    x = 2,151,236.10/1,578.45
  6. Step 6: Final answer
    x = 1,362.88

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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.