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Finding the Fourth Proportional to 1,421.27, 1,961.04 and 831.45

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Solution

The fourth proportional to 1,421.27, 1,961.04 and 831.45 is: 1,147.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.27 : 1,961.04 = 831.45 : x
  2. Step 2: Convert to fraction form
    1,421.27/1,961.04 = 831.45/x
  3. Step 3: Cross multiply
    1,421.27x = 1,961.04 × 831.45
  4. Step 4: Simplify right side
    1,421.27x = 1,630,506.71
  5. Step 5: Solve for x
    x = 1,630,506.71/1,421.27
  6. Step 6: Final answer
    x = 1,147.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.