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Finding the Fourth Proportional to 1,009.15, 1,516.79 and 987.62

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Solution

The fourth proportional to 1,009.15, 1,516.79 and 987.62 is: 1,484.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.15 : 1,516.79 = 987.62 : x
  2. Step 2: Convert to fraction form
    1,009.15/1,516.79 = 987.62/x
  3. Step 3: Cross multiply
    1,009.15x = 1,516.79 × 987.62
  4. Step 4: Simplify right side
    1,009.15x = 1,498,007.02
  5. Step 5: Solve for x
    x = 1,498,007.02/1,009.15
  6. Step 6: Final answer
    x = 1,484.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.