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Finding the Fourth Proportional to 985.21, 1,485.29 and 932.29

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Solution

The fourth proportional to 985.21, 1,485.29 and 932.29 is: 1,405.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.21 : 1,485.29 = 932.29 : x
  2. Step 2: Convert to fraction form
    985.21/1,485.29 = 932.29/x
  3. Step 3: Cross multiply
    985.21x = 1,485.29 × 932.29
  4. Step 4: Simplify right side
    985.21x = 1,384,718.68
  5. Step 5: Solve for x
    x = 1,384,718.68/985.21
  6. Step 6: Final answer
    x = 1,405.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.