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Finding the Fourth Proportional to 875.48, 1,313.82 and 328.12

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Solution

The fourth proportional to 875.48, 1,313.82 and 328.12 is: 492.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.48 : 1,313.82 = 328.12 : x
  2. Step 2: Convert to fraction form
    875.48/1,313.82 = 328.12/x
  3. Step 3: Cross multiply
    875.48x = 1,313.82 × 328.12
  4. Step 4: Simplify right side
    875.48x = 431,087.33
  5. Step 5: Solve for x
    x = 431,087.33/875.48
  6. Step 6: Final answer
    x = 492.40

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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.