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Finding the Fourth Proportional to 992.25, 1,491.82 and 928.06

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Solution

The fourth proportional to 992.25, 1,491.82 and 928.06 is: 1,395.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.25 : 1,491.82 = 928.06 : x
  2. Step 2: Convert to fraction form
    992.25/1,491.82 = 928.06/x
  3. Step 3: Cross multiply
    992.25x = 1,491.82 × 928.06
  4. Step 4: Simplify right side
    992.25x = 1,384,492.42
  5. Step 5: Solve for x
    x = 1,384,492.42/992.25
  6. Step 6: Final answer
    x = 1,395.31

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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.