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Finding the Fourth Proportional to 759.28, 1,047.80 and 427.68

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Solution

The fourth proportional to 759.28, 1,047.80 and 427.68 is: 590.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.28 : 1,047.80 = 427.68 : x
  2. Step 2: Convert to fraction form
    759.28/1,047.80 = 427.68/x
  3. Step 3: Cross multiply
    759.28x = 1,047.80 × 427.68
  4. Step 4: Simplify right side
    759.28x = 448,123.10
  5. Step 5: Solve for x
    x = 448,123.10/759.28
  6. Step 6: Final answer
    x = 590.19

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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.