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Finding the Fourth Proportional to 988.91, 1,363.57 and 673.52

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Solution

The fourth proportional to 988.91, 1,363.57 and 673.52 is: 928.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.91 : 1,363.57 = 673.52 : x
  2. Step 2: Convert to fraction form
    988.91/1,363.57 = 673.52/x
  3. Step 3: Cross multiply
    988.91x = 1,363.57 × 673.52
  4. Step 4: Simplify right side
    988.91x = 918,383.16
  5. Step 5: Solve for x
    x = 918,383.16/988.91
  6. Step 6: Final answer
    x = 928.68

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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.