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Finding the Fourth Proportional to 760, 1,048.80 and 428.42

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Solution

The fourth proportional to 760, 1,048.80 and 428.42 is: 591.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    760 : 1,048.80 = 428.42 : x
  2. Step 2: Convert to fraction form
    760/1,048.80 = 428.42/x
  3. Step 3: Cross multiply
    760x = 1,048.80 × 428.42
  4. Step 4: Simplify right side
    760x = 449,326.90
  5. Step 5: Solve for x
    x = 449,326.90/760
  6. Step 6: Final answer
    x = 591.22

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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.