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Finding the Fourth Proportional to 985.22, 1,475.40 and 724.60

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Solution

The fourth proportional to 985.22, 1,475.40 and 724.60 is: 1,085.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.22 : 1,475.40 = 724.60 : x
  2. Step 2: Convert to fraction form
    985.22/1,475.40 = 724.60/x
  3. Step 3: Cross multiply
    985.22x = 1,475.40 × 724.60
  4. Step 4: Simplify right side
    985.22x = 1,069,074.84
  5. Step 5: Solve for x
    x = 1,069,074.84/985.22
  6. Step 6: Final answer
    x = 1,085.11

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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.