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Finding the Fourth Proportional to 992.18, 1,488.37 and 261.81

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Solution

The fourth proportional to 992.18, 1,488.37 and 261.81 is: 392.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.18 : 1,488.37 = 261.81 : x
  2. Step 2: Convert to fraction form
    992.18/1,488.37 = 261.81/x
  3. Step 3: Cross multiply
    992.18x = 1,488.37 × 261.81
  4. Step 4: Simplify right side
    992.18x = 389,670.15
  5. Step 5: Solve for x
    x = 389,670.15/992.18
  6. Step 6: Final answer
    x = 392.74

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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.