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Finding the Fourth Proportional to 1,090.45, 1,632.68 and 761.72

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Solution

The fourth proportional to 1,090.45, 1,632.68 and 761.72 is: 1,140.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.45 : 1,632.68 = 761.72 : x
  2. Step 2: Convert to fraction form
    1,090.45/1,632.68 = 761.72/x
  3. Step 3: Cross multiply
    1,090.45x = 1,632.68 × 761.72
  4. Step 4: Simplify right side
    1,090.45x = 1,243,635.89
  5. Step 5: Solve for x
    x = 1,243,635.89/1,090.45
  6. Step 6: Final answer
    x = 1,140.48

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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.