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Finding the Fourth Proportional to 760.21, 1,049.04 and 428.56

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Solution

The fourth proportional to 760.21, 1,049.04 and 428.56 is: 591.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.21 : 1,049.04 = 428.56 : x
  2. Step 2: Convert to fraction form
    760.21/1,049.04 = 428.56/x
  3. Step 3: Cross multiply
    760.21x = 1,049.04 × 428.56
  4. Step 4: Simplify right side
    760.21x = 449,576.58
  5. Step 5: Solve for x
    x = 449,576.58/760.21
  6. Step 6: Final answer
    x = 591.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.