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Finding the Fourth Proportional to 1,539.75, 2,310.05 and 661.81

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Solution

The fourth proportional to 1,539.75, 2,310.05 and 661.81 is: 992.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.75 : 2,310.05 = 661.81 : x
  2. Step 2: Convert to fraction form
    1,539.75/2,310.05 = 661.81/x
  3. Step 3: Cross multiply
    1,539.75x = 2,310.05 × 661.81
  4. Step 4: Simplify right side
    1,539.75x = 1,528,814.19
  5. Step 5: Solve for x
    x = 1,528,814.19/1,539.75
  6. Step 6: Final answer
    x = 992.90

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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.