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Finding the Fourth Proportional to 840.74, 1,261.29 and 292.88

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Solution

The fourth proportional to 840.74, 1,261.29 and 292.88 is: 439.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.74 : 1,261.29 = 292.88 : x
  2. Step 2: Convert to fraction form
    840.74/1,261.29 = 292.88/x
  3. Step 3: Cross multiply
    840.74x = 1,261.29 × 292.88
  4. Step 4: Simplify right side
    840.74x = 369,406.62
  5. Step 5: Solve for x
    x = 369,406.62/840.74
  6. Step 6: Final answer
    x = 439.38

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1.5x scale

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.