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Finding the Fourth Proportional to 1,395.92, 1,926.41 and 864.89

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Solution

The fourth proportional to 1,395.92, 1,926.41 and 864.89 is: 1,193.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.92 : 1,926.41 = 864.89 : x
  2. Step 2: Convert to fraction form
    1,395.92/1,926.41 = 864.89/x
  3. Step 3: Cross multiply
    1,395.92x = 1,926.41 × 864.89
  4. Step 4: Simplify right side
    1,395.92x = 1,666,132.74
  5. Step 5: Solve for x
    x = 1,666,132.74/1,395.92
  6. Step 6: Final answer
    x = 1,193.57

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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.