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Finding the Fourth Proportional to 771.71, 1,159.14 and 751.19

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Solution

The fourth proportional to 771.71, 1,159.14 and 751.19 is: 1,128.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.71 : 1,159.14 = 751.19 : x
  2. Step 2: Convert to fraction form
    771.71/1,159.14 = 751.19/x
  3. Step 3: Cross multiply
    771.71x = 1,159.14 × 751.19
  4. Step 4: Simplify right side
    771.71x = 870,728.58
  5. Step 5: Solve for x
    x = 870,728.58/771.71
  6. Step 6: Final answer
    x = 1,128.32

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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.