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Finding the Fourth Proportional to 911.48, 1,257.07 and 770.38

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Solution

The fourth proportional to 911.48, 1,257.07 and 770.38 is: 1,062.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.48 : 1,257.07 = 770.38 : x
  2. Step 2: Convert to fraction form
    911.48/1,257.07 = 770.38/x
  3. Step 3: Cross multiply
    911.48x = 1,257.07 × 770.38
  4. Step 4: Simplify right side
    911.48x = 968,421.59
  5. Step 5: Solve for x
    x = 968,421.59/911.48
  6. Step 6: Final answer
    x = 1,062.47

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1.5x scale

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.