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Finding the Fourth Proportional to 1,355, 1,869.89 and 765.52

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Solution

The fourth proportional to 1,355, 1,869.89 and 765.52 is: 1,056.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355 : 1,869.89 = 765.52 : x
  2. Step 2: Convert to fraction form
    1,355/1,869.89 = 765.52/x
  3. Step 3: Cross multiply
    1,355x = 1,869.89 × 765.52
  4. Step 4: Simplify right side
    1,355x = 1,431,438.19
  5. Step 5: Solve for x
    x = 1,431,438.19/1,355
  6. Step 6: Final answer
    x = 1,056.41

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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.