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Finding the Fourth Proportional to 777.68, 1,170.77 and 709.64

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Solution

The fourth proportional to 777.68, 1,170.77 and 709.64 is: 1,068.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.68 : 1,170.77 = 709.64 : x
  2. Step 2: Convert to fraction form
    777.68/1,170.77 = 709.64/x
  3. Step 3: Cross multiply
    777.68x = 1,170.77 × 709.64
  4. Step 4: Simplify right side
    777.68x = 830,821.14
  5. Step 5: Solve for x
    x = 830,821.14/777.68
  6. Step 6: Final answer
    x = 1,068.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.