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Finding the Fourth Proportional to 985.89, 1,478.51 and 327.59

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Solution

The fourth proportional to 985.89, 1,478.51 and 327.59 is: 491.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.89 : 1,478.51 = 327.59 : x
  2. Step 2: Convert to fraction form
    985.89/1,478.51 = 327.59/x
  3. Step 3: Cross multiply
    985.89x = 1,478.51 × 327.59
  4. Step 4: Simplify right side
    985.89x = 484,337.28
  5. Step 5: Solve for x
    x = 484,337.28/985.89
  6. Step 6: Final answer
    x = 491.27

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1.5x scale

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.