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Finding the Fourth Proportional to 840.71, 1,261.08 and 292.91

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Solution

The fourth proportional to 840.71, 1,261.08 and 292.91 is: 439.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.71 : 1,261.08 = 292.91 : x
  2. Step 2: Convert to fraction form
    840.71/1,261.08 = 292.91/x
  3. Step 3: Cross multiply
    840.71x = 1,261.08 × 292.91
  4. Step 4: Simplify right side
    840.71x = 369,382.94
  5. Step 5: Solve for x
    x = 369,382.94/840.71
  6. Step 6: Final answer
    x = 439.37

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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.