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Finding the Fourth Proportional to 759.89, 1,048.65 and 428.32

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Solution

The fourth proportional to 759.89, 1,048.65 and 428.32 is: 591.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.89 : 1,048.65 = 428.32 : x
  2. Step 2: Convert to fraction form
    759.89/1,048.65 = 428.32/x
  3. Step 3: Cross multiply
    759.89x = 1,048.65 × 428.32
  4. Step 4: Simplify right side
    759.89x = 449,157.77
  5. Step 5: Solve for x
    x = 449,157.77/759.89
  6. Step 6: Final answer
    x = 591.08

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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.