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Finding the Fourth Proportional to 985.21, 1,478.00 and 491.67

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Solution

The fourth proportional to 985.21, 1,478.00 and 491.67 is: 737.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.21 : 1,478.00 = 491.67 : x
  2. Step 2: Convert to fraction form
    985.21/1,478.00 = 491.67/x
  3. Step 3: Cross multiply
    985.21x = 1,478.00 × 491.67
  4. Step 4: Simplify right side
    985.21x = 726,686.72
  5. Step 5: Solve for x
    x = 726,686.72/985.21
  6. Step 6: Final answer
    x = 737.59

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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.