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Finding the Fourth Proportional to 801.07, 1,200.79 and 313.45

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Solution

The fourth proportional to 801.07, 1,200.79 and 313.45 is: 469.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.07 : 1,200.79 = 313.45 : x
  2. Step 2: Convert to fraction form
    801.07/1,200.79 = 313.45/x
  3. Step 3: Cross multiply
    801.07x = 1,200.79 × 313.45
  4. Step 4: Simplify right side
    801.07x = 376,387.63
  5. Step 5: Solve for x
    x = 376,387.63/801.07
  6. Step 6: Final answer
    x = 469.86

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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.