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Finding the Fourth Proportional to 875.77, 1,313.65 and 328.21

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Solution

The fourth proportional to 875.77, 1,313.65 and 328.21 is: 492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.77 : 1,313.65 = 328.21 : x
  2. Step 2: Convert to fraction form
    875.77/1,313.65 = 328.21/x
  3. Step 3: Cross multiply
    875.77x = 1,313.65 × 328.21
  4. Step 4: Simplify right side
    875.77x = 431,148.96
  5. Step 5: Solve for x
    x = 431,148.96/875.77
  6. Step 6: Final answer
    x = 492.31

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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.