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Finding the Fourth Proportional to 985.29, 1,480.71 and 744.72

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Solution

The fourth proportional to 985.29, 1,480.71 and 744.72 is: 1,119.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.29 : 1,480.71 = 744.72 : x
  2. Step 2: Convert to fraction form
    985.29/1,480.71 = 744.72/x
  3. Step 3: Cross multiply
    985.29x = 1,480.71 × 744.72
  4. Step 4: Simplify right side
    985.29x = 1,102,714.35
  5. Step 5: Solve for x
    x = 1,102,714.35/985.29
  6. Step 6: Final answer
    x = 1,119.18

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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.