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Finding the Fourth Proportional to 1,578.42, 2,177.16 and 987.93

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Solution

The fourth proportional to 1,578.42, 2,177.16 and 987.93 is: 1,362.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.42 : 2,177.16 = 987.93 : x
  2. Step 2: Convert to fraction form
    1,578.42/2,177.16 = 987.93/x
  3. Step 3: Cross multiply
    1,578.42x = 2,177.16 × 987.93
  4. Step 4: Simplify right side
    1,578.42x = 2,150,881.68
  5. Step 5: Solve for x
    x = 2,150,881.68/1,578.42
  6. Step 6: Final answer
    x = 1,362.68

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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.