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Finding the Fourth Proportional to 1,140.21, 1,707.12 and 728.31

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Solution

The fourth proportional to 1,140.21, 1,707.12 and 728.31 is: 1,090.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.21 : 1,707.12 = 728.31 : x
  2. Step 2: Convert to fraction form
    1,140.21/1,707.12 = 728.31/x
  3. Step 3: Cross multiply
    1,140.21x = 1,707.12 × 728.31
  4. Step 4: Simplify right side
    1,140.21x = 1,243,312.57
  5. Step 5: Solve for x
    x = 1,243,312.57/1,140.21
  6. Step 6: Final answer
    x = 1,090.42

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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.