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Finding the Fourth Proportional to 1,020.81, 1,530.69 and 728.16

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Solution

The fourth proportional to 1,020.81, 1,530.69 and 728.16 is: 1,091.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.81 : 1,530.69 = 728.16 : x
  2. Step 2: Convert to fraction form
    1,020.81/1,530.69 = 728.16/x
  3. Step 3: Cross multiply
    1,020.81x = 1,530.69 × 728.16
  4. Step 4: Simplify right side
    1,020.81x = 1,114,587.23
  5. Step 5: Solve for x
    x = 1,114,587.23/1,020.81
  6. Step 6: Final answer
    x = 1,091.87

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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.