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Finding the Fourth Proportional to 985.20, 1,477.83 and 465.45

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Solution

The fourth proportional to 985.20, 1,477.83 and 465.45 is: 698.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.20 : 1,477.83 = 465.45 : x
  2. Step 2: Convert to fraction form
    985.20/1,477.83 = 465.45/x
  3. Step 3: Cross multiply
    985.20x = 1,477.83 × 465.45
  4. Step 4: Simplify right side
    985.20x = 687,849.56
  5. Step 5: Solve for x
    x = 687,849.56/985.20
  6. Step 6: Final answer
    x = 698.18

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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.