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Finding the Fourth Proportional to 1,493.40, 2,239.76 and 878.31

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Solution

The fourth proportional to 1,493.40, 2,239.76 and 878.31 is: 1,317.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,493.40 : 2,239.76 = 878.31 : x
  2. Step 2: Convert to fraction form
    1,493.40/2,239.76 = 878.31/x
  3. Step 3: Cross multiply
    1,493.40x = 2,239.76 × 878.31
  4. Step 4: Simplify right side
    1,493.40x = 1,967,203.61
  5. Step 5: Solve for x
    x = 1,967,203.61/1,493.40
  6. Step 6: Final answer
    x = 1,317.27

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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.