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Finding the Fourth Proportional to 991.92, 1,486.89 and 375.45

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Solution

The fourth proportional to 991.92, 1,486.89 and 375.45 is: 562.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.92 : 1,486.89 = 375.45 : x
  2. Step 2: Convert to fraction form
    991.92/1,486.89 = 375.45/x
  3. Step 3: Cross multiply
    991.92x = 1,486.89 × 375.45
  4. Step 4: Simplify right side
    991.92x = 558,252.85
  5. Step 5: Solve for x
    x = 558,252.85/991.92
  6. Step 6: Final answer
    x = 562.80

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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.