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Finding the Fourth Proportional to 753.40, 1,039.71 and 421.84

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Solution

The fourth proportional to 753.40, 1,039.71 and 421.84 is: 582.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.40 : 1,039.71 = 421.84 : x
  2. Step 2: Convert to fraction form
    753.40/1,039.71 = 421.84/x
  3. Step 3: Cross multiply
    753.40x = 1,039.71 × 421.84
  4. Step 4: Simplify right side
    753.40x = 438,591.27
  5. Step 5: Solve for x
    x = 438,591.27/753.40
  6. Step 6: Final answer
    x = 582.15

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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.