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Finding the Fourth Proportional to 840.77, 1,259.93 and 531.65

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Solution

The fourth proportional to 840.77, 1,259.93 and 531.65 is: 796.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.77 : 1,259.93 = 531.65 : x
  2. Step 2: Convert to fraction form
    840.77/1,259.93 = 531.65/x
  3. Step 3: Cross multiply
    840.77x = 1,259.93 × 531.65
  4. Step 4: Simplify right side
    840.77x = 669,832.83
  5. Step 5: Solve for x
    x = 669,832.83/840.77
  6. Step 6: Final answer
    x = 796.69

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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.