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Finding the Fourth Proportional to 1,011.51, 1,517.81 and 993.42

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Solution

The fourth proportional to 1,011.51, 1,517.81 and 993.42 is: 1,490.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.51 : 1,517.81 = 993.42 : x
  2. Step 2: Convert to fraction form
    1,011.51/1,517.81 = 993.42/x
  3. Step 3: Cross multiply
    1,011.51x = 1,517.81 × 993.42
  4. Step 4: Simplify right side
    1,011.51x = 1,507,817.84
  5. Step 5: Solve for x
    x = 1,507,817.84/1,011.51
  6. Step 6: Final answer
    x = 1,490.66

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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.