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Finding the Fourth Proportional to 772.48, 1,157.70 and 406.48

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Solution

The fourth proportional to 772.48, 1,157.70 and 406.48 is: 609.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.48 : 1,157.70 = 406.48 : x
  2. Step 2: Convert to fraction form
    772.48/1,157.70 = 406.48/x
  3. Step 3: Cross multiply
    772.48x = 1,157.70 × 406.48
  4. Step 4: Simplify right side
    772.48x = 470,581.90
  5. Step 5: Solve for x
    x = 470,581.90/772.48
  6. Step 6: Final answer
    x = 609.18

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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.