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Finding the Fourth Proportional to 840.86, 1,261.50 and 293.05

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Solution

The fourth proportional to 840.86, 1,261.50 and 293.05 is: 439.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.86 : 1,261.50 = 293.05 : x
  2. Step 2: Convert to fraction form
    840.86/1,261.50 = 293.05/x
  3. Step 3: Cross multiply
    840.86x = 1,261.50 × 293.05
  4. Step 4: Simplify right side
    840.86x = 369,674.80
  5. Step 5: Solve for x
    x = 369,674.80/840.86
  6. Step 6: Final answer
    x = 439.64

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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.