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Finding the Fourth Proportional to 770.87, 1,157.30 and 661.89

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Solution

The fourth proportional to 770.87, 1,157.30 and 661.89 is: 993.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.87 : 1,157.30 = 661.89 : x
  2. Step 2: Convert to fraction form
    770.87/1,157.30 = 661.89/x
  3. Step 3: Cross multiply
    770.87x = 1,157.30 × 661.89
  4. Step 4: Simplify right side
    770.87x = 766,001.06
  5. Step 5: Solve for x
    x = 766,001.06/770.87
  6. Step 6: Final answer
    x = 993.69

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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.