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Finding the Fourth Proportional to 685.30, 950.57 and 661.99

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Solution

The fourth proportional to 685.30, 950.57 and 661.99 is: 918.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.30 : 950.57 = 661.99 : x
  2. Step 2: Convert to fraction form
    685.30/950.57 = 661.99/x
  3. Step 3: Cross multiply
    685.30x = 950.57 × 661.99
  4. Step 4: Simplify right side
    685.30x = 629,267.83
  5. Step 5: Solve for x
    x = 629,267.83/685.30
  6. Step 6: Final answer
    x = 918.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.