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Finding the Fourth Proportional to 840.87, 1,261.96 and 582.68

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Solution

The fourth proportional to 840.87, 1,261.96 and 582.68 is: 874.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.87 : 1,261.96 = 582.68 : x
  2. Step 2: Convert to fraction form
    840.87/1,261.96 = 582.68/x
  3. Step 3: Cross multiply
    840.87x = 1,261.96 × 582.68
  4. Step 4: Simplify right side
    840.87x = 735,315.51
  5. Step 5: Solve for x
    x = 735,315.51/840.87
  6. Step 6: Final answer
    x = 874.47

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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.