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Finding the Fourth Proportional to 1,395.20, 1,926 and 916.64

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Solution

The fourth proportional to 1,395.20, 1,926 and 916.64 is: 1,265.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.20 : 1,926 = 916.64 : x
  2. Step 2: Convert to fraction form
    1,395.20/1,926 = 916.64/x
  3. Step 3: Cross multiply
    1,395.20x = 1,926 × 916.64
  4. Step 4: Simplify right side
    1,395.20x = 1,765,448.64
  5. Step 5: Solve for x
    x = 1,765,448.64/1,395.20
  6. Step 6: Final answer
    x = 1,265.37

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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.