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Finding the Fourth Proportional to 1,004.80, 1,507.92 and 427.84

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Solution

The fourth proportional to 1,004.80, 1,507.92 and 427.84 is: 642.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.80 : 1,507.92 = 427.84 : x
  2. Step 2: Convert to fraction form
    1,004.80/1,507.92 = 427.84/x
  3. Step 3: Cross multiply
    1,004.80x = 1,507.92 × 427.84
  4. Step 4: Simplify right side
    1,004.80x = 645,148.49
  5. Step 5: Solve for x
    x = 645,148.49/1,004.80
  6. Step 6: Final answer
    x = 642.07

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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.