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Finding the Fourth Proportional to 760.61, 1,139.39 and 349.18

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Solution

The fourth proportional to 760.61, 1,139.39 and 349.18 is: 523.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.61 : 1,139.39 = 349.18 : x
  2. Step 2: Convert to fraction form
    760.61/1,139.39 = 349.18/x
  3. Step 3: Cross multiply
    760.61x = 1,139.39 × 349.18
  4. Step 4: Simplify right side
    760.61x = 397,847.61
  5. Step 5: Solve for x
    x = 397,847.61/760.61
  6. Step 6: Final answer
    x = 523.07

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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.