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Finding the Fourth Proportional to 1,151.35, 1,727.46 and 421.43

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Solution

The fourth proportional to 1,151.35, 1,727.46 and 421.43 is: 632.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.35 : 1,727.46 = 421.43 : x
  2. Step 2: Convert to fraction form
    1,151.35/1,727.46 = 421.43/x
  3. Step 3: Cross multiply
    1,151.35x = 1,727.46 × 421.43
  4. Step 4: Simplify right side
    1,151.35x = 727,994.83
  5. Step 5: Solve for x
    x = 727,994.83/1,151.35
  6. Step 6: Final answer
    x = 632.30

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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.