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Finding the Fourth Proportional to 1,399.66, 1,931.51 and 770.09

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Solution

The fourth proportional to 1,399.66, 1,931.51 and 770.09 is: 1,062.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.66 : 1,931.51 = 770.09 : x
  2. Step 2: Convert to fraction form
    1,399.66/1,931.51 = 770.09/x
  3. Step 3: Cross multiply
    1,399.66x = 1,931.51 × 770.09
  4. Step 4: Simplify right side
    1,399.66x = 1,487,428.80
  5. Step 5: Solve for x
    x = 1,487,428.80/1,399.66
  6. Step 6: Final answer
    x = 1,062.71

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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.