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Finding the Fourth Proportional to 753.59, 1,039.90 and 421.98

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Solution

The fourth proportional to 753.59, 1,039.90 and 421.98 is: 582.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.59 : 1,039.90 = 421.98 : x
  2. Step 2: Convert to fraction form
    753.59/1,039.90 = 421.98/x
  3. Step 3: Cross multiply
    753.59x = 1,039.90 × 421.98
  4. Step 4: Simplify right side
    753.59x = 438,813.00
  5. Step 5: Solve for x
    x = 438,813.00/753.59
  6. Step 6: Final answer
    x = 582.29

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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.