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Finding the Fourth Proportional to 1,421.58, 1,961.42 and 831.70

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Solution

The fourth proportional to 1,421.58, 1,961.42 and 831.70 is: 1,147.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.58 : 1,961.42 = 831.70 : x
  2. Step 2: Convert to fraction form
    1,421.58/1,961.42 = 831.70/x
  3. Step 3: Cross multiply
    1,421.58x = 1,961.42 × 831.70
  4. Step 4: Simplify right side
    1,421.58x = 1,631,311.31
  5. Step 5: Solve for x
    x = 1,631,311.31/1,421.58
  6. Step 6: Final answer
    x = 1,147.53

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1.5x scale

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.