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Finding the Fourth Proportional to 760.32, 1,139.76 and 516.96

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Solution

The fourth proportional to 760.32, 1,139.76 and 516.96 is: 774.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.32 : 1,139.76 = 516.96 : x
  2. Step 2: Convert to fraction form
    760.32/1,139.76 = 516.96/x
  3. Step 3: Cross multiply
    760.32x = 1,139.76 × 516.96
  4. Step 4: Simplify right side
    760.32x = 589,210.33
  5. Step 5: Solve for x
    x = 589,210.33/760.32
  6. Step 6: Final answer
    x = 774.95

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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.