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Finding the Fourth Proportional to 1,578.47, 2,178.96 and 988.88

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Solution

The fourth proportional to 1,578.47, 2,178.96 and 988.88 is: 1,365.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.47 : 2,178.96 = 988.88 : x
  2. Step 2: Convert to fraction form
    1,578.47/2,178.96 = 988.88/x
  3. Step 3: Cross multiply
    1,578.47x = 2,178.96 × 988.88
  4. Step 4: Simplify right side
    1,578.47x = 2,154,729.96
  5. Step 5: Solve for x
    x = 2,154,729.96/1,578.47
  6. Step 6: Final answer
    x = 1,365.08

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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.