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Finding the Fourth Proportional to 991.02, 1,485.45 and 644.60

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Solution

The fourth proportional to 991.02, 1,485.45 and 644.60 is: 966.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.02 : 1,485.45 = 644.60 : x
  2. Step 2: Convert to fraction form
    991.02/1,485.45 = 644.60/x
  3. Step 3: Cross multiply
    991.02x = 1,485.45 × 644.60
  4. Step 4: Simplify right side
    991.02x = 957,521.63
  5. Step 5: Solve for x
    x = 957,521.63/991.02
  6. Step 6: Final answer
    x = 966.20

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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.