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Finding the Fourth Proportional to 1,169.46, 1,613.88 and 777.20

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Solution

The fourth proportional to 1,169.46, 1,613.88 and 777.20 is: 1,072.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.46 : 1,613.88 = 777.20 : x
  2. Step 2: Convert to fraction form
    1,169.46/1,613.88 = 777.20/x
  3. Step 3: Cross multiply
    1,169.46x = 1,613.88 × 777.20
  4. Step 4: Simplify right side
    1,169.46x = 1,254,299.47
  5. Step 5: Solve for x
    x = 1,254,299.47/1,169.46
  6. Step 6: Final answer
    x = 1,072.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.