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Finding the Fourth Proportional to 945.71, 1,421.81 and 874.43

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Solution

The fourth proportional to 945.71, 1,421.81 and 874.43 is: 1,314.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.71 : 1,421.81 = 874.43 : x
  2. Step 2: Convert to fraction form
    945.71/1,421.81 = 874.43/x
  3. Step 3: Cross multiply
    945.71x = 1,421.81 × 874.43
  4. Step 4: Simplify right side
    945.71x = 1,243,268.95
  5. Step 5: Solve for x
    x = 1,243,268.95/945.71
  6. Step 6: Final answer
    x = 1,314.64

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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.