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Finding the Fourth Proportional to 845.20, 1,267.78 and 434.10

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Solution

The fourth proportional to 845.20, 1,267.78 and 434.10 is: 651.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.20 : 1,267.78 = 434.10 : x
  2. Step 2: Convert to fraction form
    845.20/1,267.78 = 434.10/x
  3. Step 3: Cross multiply
    845.20x = 1,267.78 × 434.10
  4. Step 4: Simplify right side
    845.20x = 550,343.30
  5. Step 5: Solve for x
    x = 550,343.30/845.20
  6. Step 6: Final answer
    x = 651.14

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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.