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Finding the Fourth Proportional to 1,577.05, 2,176.50 and 987.91

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Solution

The fourth proportional to 1,577.05, 2,176.50 and 987.91 is: 1,363.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,577.05 : 2,176.50 = 987.91 : x
  2. Step 2: Convert to fraction form
    1,577.05/2,176.50 = 987.91/x
  3. Step 3: Cross multiply
    1,577.05x = 2,176.50 × 987.91
  4. Step 4: Simplify right side
    1,577.05x = 2,150,186.12
  5. Step 5: Solve for x
    x = 2,150,186.12/1,577.05
  6. Step 6: Final answer
    x = 1,363.42

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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.