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Finding the Fourth Proportional to 991.78, 1,485.20 and 601.96

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Solution

The fourth proportional to 991.78, 1,485.20 and 601.96 is: 901.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.78 : 1,485.20 = 601.96 : x
  2. Step 2: Convert to fraction form
    991.78/1,485.20 = 601.96/x
  3. Step 3: Cross multiply
    991.78x = 1,485.20 × 601.96
  4. Step 4: Simplify right side
    991.78x = 894,030.99
  5. Step 5: Solve for x
    x = 894,030.99/991.78
  6. Step 6: Final answer
    x = 901.44

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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.