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Finding the Fourth Proportional to 760.40, 1,139.56 and 394.44

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Solution

The fourth proportional to 760.40, 1,139.56 and 394.44 is: 591.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.40 : 1,139.56 = 394.44 : x
  2. Step 2: Convert to fraction form
    760.40/1,139.56 = 394.44/x
  3. Step 3: Cross multiply
    760.40x = 1,139.56 × 394.44
  4. Step 4: Simplify right side
    760.40x = 449,488.05
  5. Step 5: Solve for x
    x = 449,488.05/760.40
  6. Step 6: Final answer
    x = 591.12

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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.