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Finding the Fourth Proportional to 1,277.42, 1,917.15 and 661.31

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Solution

The fourth proportional to 1,277.42, 1,917.15 and 661.31 is: 992.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.42 : 1,917.15 = 661.31 : x
  2. Step 2: Convert to fraction form
    1,277.42/1,917.15 = 661.31/x
  3. Step 3: Cross multiply
    1,277.42x = 1,917.15 × 661.31
  4. Step 4: Simplify right side
    1,277.42x = 1,267,820.88
  5. Step 5: Solve for x
    x = 1,267,820.88/1,277.42
  6. Step 6: Final answer
    x = 992.49

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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.