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Finding the Fourth Proportional to 770.97, 1,157.15 and 406.02

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Solution

The fourth proportional to 770.97, 1,157.15 and 406.02 is: 609.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.97 : 1,157.15 = 406.02 : x
  2. Step 2: Convert to fraction form
    770.97/1,157.15 = 406.02/x
  3. Step 3: Cross multiply
    770.97x = 1,157.15 × 406.02
  4. Step 4: Simplify right side
    770.97x = 469,826.04
  5. Step 5: Solve for x
    x = 469,826.04/770.97
  6. Step 6: Final answer
    x = 609.40

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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.