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Finding the Fourth Proportional to 760.89, 1,140.38 and 516.81

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Solution

The fourth proportional to 760.89, 1,140.38 and 516.81 is: 774.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.89 : 1,140.38 = 516.81 : x
  2. Step 2: Convert to fraction form
    760.89/1,140.38 = 516.81/x
  3. Step 3: Cross multiply
    760.89x = 1,140.38 × 516.81
  4. Step 4: Simplify right side
    760.89x = 589,357.20
  5. Step 5: Solve for x
    x = 589,357.20/760.89
  6. Step 6: Final answer
    x = 774.56

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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.