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Finding the Fourth Proportional to 847.18, 1,271.30 and 840.22

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Solution

The fourth proportional to 847.18, 1,271.30 and 840.22 is: 1,260.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.18 : 1,271.30 = 840.22 : x
  2. Step 2: Convert to fraction form
    847.18/1,271.30 = 840.22/x
  3. Step 3: Cross multiply
    847.18x = 1,271.30 × 840.22
  4. Step 4: Simplify right side
    847.18x = 1,068,171.69
  5. Step 5: Solve for x
    x = 1,068,171.69/847.18
  6. Step 6: Final answer
    x = 1,260.86

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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.