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Finding the Fourth Proportional to 875.95, 1,313.48 and 320.49

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Solution

The fourth proportional to 875.95, 1,313.48 and 320.49 is: 480.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.95 : 1,313.48 = 320.49 : x
  2. Step 2: Convert to fraction form
    875.95/1,313.48 = 320.49/x
  3. Step 3: Cross multiply
    875.95x = 1,313.48 × 320.49
  4. Step 4: Simplify right side
    875.95x = 420,958.01
  5. Step 5: Solve for x
    x = 420,958.01/875.95
  6. Step 6: Final answer
    x = 480.57

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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.